ASSESSMENT OF EFFICIENCY OF ARTIFICIAL INSEMINATION SERVICE IN CATTLE PRODUCTION IN THE WESTERN ZONE OF TIGRAY REGION, ETHIOPIA
DOI:
https://doi.org/10.36547/sjas.829Keywords:
artificial insemination, breeding program, reproduction, service number per conception, conception rate, calving rateAbstract
The study was conducted before the ignition (before October 2020) of the war in Tigray Region, Ethiopia. Artificial insemination (AI) is the first generation biotechnology and is one of the assisted reproductive techniques (ART) that greatly plays for a faster genetic improvement of farm animals. Though AI was implemented in cattle crossbreeding for many decades in Ethiopia, there is quite insignificant national output of crossbred cattle population (1.54 %). The aim of the survey was to assess the efficiency of AI service in cattle production in the Western Zone of Tigray Region, Ethiopia. Twenty (20) Kebeles and 353 small-scale farmers were purposively involved in the household face-to-face survey interview. The data were analyzed using Statistical Package for Social Sciences (SPSS), and summarized by mean, frequency and percentages. The survey indicated that the existing reproductive efficiency of cattle AI service in the Western Zone of Tigray Region, Ethiopia was extremely poor. The mean number of services per conception (NSC) was very high that could be due to mainly inappropriate heat detections. The recommended, acceptable and excellent grade of NSC fall in the range of 1 − 1.7. The overall conception rate at first insemination (CRFI) was also very poor (20.4 %) and thus calving rate (CR) was poor (20.5 %). About one-third (33.4 %) of the respondents indicated that cows and heifers exhibited heat in 0:01 − 6:00 am of the day. About 30.9 % and 28.6 % of the respondents reported that their cows and heifers were inseminated in 9 − 12 hours and 4 − 8 hours after the onset of heat, respectively. The majority (70.8 %) of the respondents did not practice controlled mating and breeding, and the first preference of 50.1 % of the respondents was natural mating. The most common source of bulls for about 34.3 % of the respondents was from neighbors and followed by own bred bulls (30.0 %). Cattle AI feasibility study and identification of AI strategic interventions should be the first focus to improve the existing poor AI efficiency of the study area.
References
Abiyot, H. & Eyob, E. (2019). Evaluation on the Efficiency of Artificial Insemination Following Estrus Synchronization of Dairy Cattle: In the Case of Sodo Zuria District, Ethiopia. EC Veterinary Science, 4(4), 226−233.
Akhtarul, I., Jalal, U. S., Syed, S. J. & Hemayatul I. (2016). Evaluate the Productive and Reproductive Performance Considering Genotypes of Dairy Cows. International Journal of Nutrition and Food Sciences. Special Issue: Analytical and Microbiological Characterization of Antimicrobial Peptides, 5, 10−15. DOI: 10.11648/j.ijnfs.s.2016050601.13
Alberro, M. (1983). Comparative performance of F1 Friesian x Zebu heifers in Ethiopia. Animal Production, 37, 247−252.
Alemshet, B., Weldegerima, K. & Yoseph, M. (2017). Reproductive Efficiency of Crossbred (HF x Zebu) Dairy Cows under Artificial Insemination Service in Eastern Zone of Tigray, Northern Ethiopia. International Journal of Basic and Applied Biology, 4(3), 60−163.
Alewya, H. (2014). Comparative Study of Reproductive and Productive Performance of Holstein Friesian Dairy Cows at Holetta Bull Dam Station and Genesis Farms. MSc. Thesis, Addis Ababa University, Ethiopia.
Ali, T., Lemma, A. & Yilma, T. (2015). Effect of Management Practices on Reproductive Performance of Smallholder Dairy Cattle. Austin Journal of Veterinary Science & Animal Husbandry, 2(3), 1015.
Ambrose, D. J. & Colazo, M. G. (2007). Reproductive status of dairy herds in Alberta: a closer look. Advances in Dairy Technology, 19, 227−244.
Ansari-Lari, M., Kafi, M., Sokhtanlo, M. & Ahmadi, H. N. (2010). Reproductive performance of Holstein dairy cows in Iran. Tropical Animal Health and Production, 42(6), 1277−1283.
Ashebir, G., Birhanu, A. & Gugsa, T. (2016). Status of Artificial Insemination in Tigray Regional State, "Constraints and Acceptability under Field Condition". Journal of Dairy, Veterinary and Animal Research, 3(3), 1−6.
Ayantu, M., Haile, A., Dessie, T. & Mekasha, Y. (2012). On farm characterization of Horro cattle breed production systems in western Oromia, Ethiopia. Livestock Research for Development, 24(100). http.//www.lrrd.org/lrrd24/6/meko24100.htm.
Aynalem, H., Workneh, A., Noah, K., Tadelle, D. & Azage, T. (2011). Breeding strategy to improve Ethiopian Boran cattle for meat and milk production. IPMS (Improving Productivity and Market Success) of Ethiopian Farmers Project Working Paper 26. Nairobi, Kenya, ILRI.
Azage, T., Galal, E. S. E. & Beyene, K. (1981). A study on the reproduction of local zebu and F1 crossbred (European x zebu) cows. I. Number of services per conception, gestation length and days open till conception. Ethiopian Journal of Agricultural Sciences, 3, 114.
Azage, T., Awet, E. Asrat, T. & Hoekstra, D. (2012). Technological option and approaches to improve smallholder access to desirable animal genetic material for dairy development. IPMS experience with hormonal oestrus synchronization and mass insemination in Ethiopia.
Azage, T., Gebremedhin, B., Hoekstra, D., Belay, B. & Mekasha, Y. (2013). Smallholder dairy production and marketing systems in Ethiopia. IPMS experiences and opportunities for market-oriented development. IPMS of Ethiopian Farmers Project Working Paper 31. Nairobi. ILRI.
Bainesagn, W. (2015). Assessment of Breeding Practices and Evaluation of Estrus Synchronization and Mass Insemination Technique in Dairy Cattle in West Shoa Zone. MSc. Thesis, Haramaya University, Ethiopia.
Bekana, M. (1991). Farm animal obstetrics. Monograph, Addis Ababa University, Ethiopia, pp. 1−12.
Belay, D., Azage, T. & Hegde, B. P. (2012a). Smallholder livestock production system in Dandi district, Oromia Regional State, central Ethiopia. Global Veterinaria, 8(5), 472−479.
Belay, D., Yisehak, K., Janssens, G. P. J. (2012b). Productive and Reproductive Performance of Zebu X Holstein-Friesian Crossbred Dairy Cows in Jimma Town, Oromia, Ethiopia. Global Veterinaria, 8(1), 67−72.
Belete, Y., Abraham, J., Abebe, A., Atilaw, W. & Alemayehu, H. (2018). Factors Affecting the Efficiency of Artificial Insemination in Dairy Cows in and Around Bishoftu (Debre Zeite), Oromia Regional State, Ethiopia. Journal of Reproduction and Infertility, 9(2), 28−35.
Bemrew, A., Alazar, W., Anmaw, S. & Saddam, M. (2015). Assessment of Problems Associated with Artificial Insemination Services in Dairy Cattle in Debretabour Town, Ethiopia. Journal of Reproduction and Infertility, 6(2), 48−55.
Bertolini, M. & Bertolini, L. R (2009). Advances in reproductive technologies in cattle: from artificial insemination to cloning. Revista de la Facultad de Medicina Veterinaria y de Zootecnia, 56, 184−194.
Boettcher, P. J. & Perera, B. M. (2007). Improving the Reproductive Management of Smallholder dairy cattle and the Effectiveness of Artificial Insemination: A Summary. In the Reproductive Management of Dairy Cattle Subjected to AI, IAEA, Vienna. ISBN 92-0-114806-2
CSA (Central Statistical Agency). (2011). Ethiopian Agricultural sample survey 2010/11. Report on livestock and livestock characteristics. Central Statistical Authority (CSA), Addis Ababa, Ethiopia, 2(502).
CSA. (2018). Ethiopian Agricultural Sample Survey. Report on Livestock and Livestock Characteristics (Private Peasant Holdings). Volume II, Statistical Bulletin, 587, Addis Ababa, Ethiopia.
Dalton, J. C. (2011). Strategies for Success in Heat Detection and Artificial Insemination. WCDS Advances in Dairy Technology, 23, 215−229.
Das, N. G., Mufti, M. M. R., Alam, M. K., Sarker, M. S. & Bostami, A. B. M. R. (2010). Study on Factors Affecting the Conception Rate in Red Chittagong Cows. Bangladesh Journal of Animal Science, 39(1−2), 52−57.
Debir, L. B. (2016b). A Review on Dairy Cattle Breeding Practices in Ethiopia. Journal of Biology, Agriculture and Healthcare, 6, 7.
Debir, L. B., Asrat, T. & Azage, T. (2016a). Evaluating the Efficiency of Artificial Insemination Following Estrus Synchronization of Dairy Cattle in Southern Region, Ethiopia: The Case of Dale District. Journal of Natural Sciences Research, 6(5), 22−27.
Demissu, H., Fekadu, B. & Gemeda, D. (2013). Early Growth and Reproductive Performances of Horro Cattle and thier F1 Jersey Crosses in and around Horro-Guduru Livestock Production and Research Center, Ethiopia. Science, Technology and Arts Research Journal, 2(3), 134−141.
Demissu, H., Fekadu, B. & Gemeda, D. (2014). Dairy Productive Potential, Challenges and Production opportunities of Horro and their F1 Jersey Crossbred Cows. A Case of Guduru Livestock production and Research Center and Its Surroundings, West Oromia, Ethiopia. Science, Technology and Arts Research Journal, 3(4), 79−84.
Dereje, B. Z. (2018). Evaluation of Estrous Synchronization and Mass Artificial Insemination Service of Dairy Cattle in East Wollega Selected Districts, Western Ethiopia. Journal of Reproduction and Infertility, 9(3), 63−66.
Desalegn, G. G. (2008). Assessment of Problems/Constraints Associated with Artificial Insemination Service in Ethiopia. MSc. Thesis, Addis Ababa University, Ethiopia.
Desta, K. B. (2002). Analyses of Dairy Cattle Breeding Practices in Selected Areas of Ethiopia. PhD Thesis, Humboldt-Universität zu Berlin, Germany, 37, 247−252.
Diskin, M. G. & Sreenan, J. M. (2000). Expression and detection of estrus in cattle. Reproduction Nutrition Development, 40, 481−491.
Emebet, M. & Zeleke, M. (2014). Reproductive performance of crossbred dairy cows in eastern lowlands of Ethiopia. Livestock Research for Rural Development, 19(11), Article Number 161.
Engidawork, B. (2018). Artificial Insemination Service Efficiency and Constraints of Artificial Insemination Service in Selected Districts of Harari National Regional State, Ethiopia. Open Journal of Animal Sciences, 8, 239−251. https://doi.org/10.4236/ojas.2018.83018.
Ermed, H. (2004). Evaluation of reproductive performance of F1 Friesian x Zebu crosses under small holder production systems in urban and peri-urban areas of North Gondar, Ethiopia. In Abstracts of DVM Thesis (1985-2005), Addis Ababa University, Ethiopia.
Fekata, A., Galmessa, U., Fita, L., Merera, C. & Bekuma, A. (2020). Dairy cattle producers' perception on Oestrus Synchronization and mass artificial insemination services in Waliso and Ilu Districts of South West Shoa Zone of Oromia, Ethiopia. Insights in Veterinary Science, 4, 10−13.
Gebremedhin, D. G. (2008). Assessment of problems/constraints associated with artificial insemination service in Ethiopia. MSc Thesis Addis Ababa University, Addis Ababa, Ethiopia, 110 p.
Foote, R. H. (2002). The history of Artificial insemination: Selected notes and notables. Journal of Animal Science, 80, 1−10.
Ganchou, F. P., Belloso, E. S., Stagnaro, C. G., Castillo, G. S. & Fonseca, H. (2005). Factors affecting fertility according to the postpartum period in crossbred dual-purpose suckling cows in the tropics. Tropical Animal Health Production, 37, 559−572.
Getabalew, M. & Alemneh, T. (2019). Status of Artificial Insemination; Its Constraints and Estrous Synchronization in Ethiopia. SM Journal of Reproductive Healthand Infertility, 4(1), 1008.
Gizaw, S., Tesfaye, Y., Mekuriaw, Z., Tadesse, M. Hoekstra, D., Gebremedhin, B. & Tegegne, A. (2016). Oestrus Synchronization for Accelerated Delivery of Improved Dairy Genetics In Ethiopia: Results From Action Research And Development Interventions. LIVES Working Paper 12. Nairobi, Kenya: International Livestock Research Institute (ILRI).
Hafez, E. S. E. (1993). Reproduction in Farm Animals. 6th ed. Lea and Febiger Philadelphia, 465−468.
Haileyesus, A. (2006). Evaluation of Artificial Insemination service efficiency and reproductive performance of F1 Friesian crosses in North Gonder Zone, Amhara Region, Ethiopia. MSc. Thesis, Alemaya University, Ethiopia, pp. 81.
Heins, B. J., Hansen, L. B. & Seykora, A. J. (2006). Fertility and survival of pure Holstein versus crossbreds of Holstein with Normande, Montbeliarde and Scandinavian Red. Journal of Dairy Science, 89, 4944−4951.
Heins, B. J. (2007). Impact of an old technology on profitable dairying in the 21st Century. 4th Biennial WE Petersen Symposium, 2007.
Hunduma, D. (2012). Reproductive performance of crossbred dairy cows under smallholder condition in Ethiopia. International Journal of Livestock Production, 3(3), 25−28.
Islam, M. S., Akhtar, A., Hossain, M. A., Rahman, M. F. & Hossain, S. S. (2017). Reproductive Performance and Repeatability Estimation of Some Traits of Crossbred Cows in Savar Dairy Farm. Journal of Environmental Science & Natural Resources, 10(2), 87−94.
Kathy, L. (2004). AI bulls ranked by conception rates. Michigan Dairy Review, 1-3, http://www.mdr.msu.edu.
Khan, F. A., Prasad, S. & Gupta, H. P. (2013). Effect of heat stress on pregnancy rates of crossbred dairy cattle in Terai region of Uttarakhand, India. Asian Pacific Journal of Reproduction, 2(4), 277−279.
Kindalem, B. (2019). The problem of Artificial Insemination (Study in Janamora Wereda). International Journal of Agriculture and Agribusiness, 3(1), 8−14.
Kinyua, J. (2016). Evaluation of Artificial Insemination Services Performance in a Smallholder Dairy Herd under Extensive Management: A Case Study of KALRO- Lanet Herd, Kenya. Weber Agricultural Research & Management, 2(2), 1−3.
Kumar, N., Yemane, A., Berihu, G. & Yohannes, H. (2014). Productive and Reproductive Performance of Local Cows under Farmer's Management in and around Mekelle, Ethiopia. IOSR Journal of Agriculture and Veterinary Science, 7(5), 21−24.
Landiver, C., Galina, C. S., Duchateou, A. & Navarro-Frierro, R. (1985). Fertility trial in zebu cattle after a natural or controlled estrus with PGF2α: comparing natural mating with AI. Theriogenology, 23, 4−21.
Legesse, D. (2015). Assessment of breeding practices and evaluation of mass estrus synchronization of dairy cattle in Sidama Zone, Southern Ethiopia. MSc. Thesis, Hawassa University, Ethiopia.
Lobago, F., Bekana, M., Gustafsson, H. & Kindahl, H. (2007). Longitudinal observation on reproductive and lactation performances of smallholder crossbred dairy cattle in Fitche, Oromia Region, Central Ethiopia. Tropical Animal Health and Production, 39, 395−403.
Lohuis, M. M. (1995). Potential benefits of bovine embryo-manipulation technologies to genetic improvement programs. Theriogenology, 43, 51−60.
Malede, B., Zerihun, B. & Tewodros, F. (2013). Assessment on Problems Associated with Artificial Insemination Services in West Gojjam Zone, Ethiopia. Advances in Biological Research, 7(2), 59−66.
Mebrahtom, B. & Hailemichael, N. (2016). Comparative Evaluation on Productive and Reproductive Performance of Indigenous and Crossbred Dairy Cow Managed under Smallholder Farmers in Endamehoni District, Tigray, Ethiopia. Journal of Biology, Agriculture and Healthcare, 6(17), 96−100.
Menale, M., Mekuriaw, Z., Mekuriaw, G. & Taye, M. (2011). Reproductive performance of Fogera cattle at Metekel Cattle Breeding and Multiplication Ranch, North West Ethiopia. Journal of Animal and Feed Research, 1(3), 99−106.
Mohamed, A. (2004). Estimation of genetic parameters of birth weight, age at first calving and milk production trait in Holstein Friesian dairy herds kept in three state farms, Ethiopia. MSc. Thesis, Alemaya University, Ethiopia.
Mugisha, A., Kayiizi, V., Owiny, D. & Mburu, J. (2014). Breeding Services and the Factors Influencing Their Use on Smallholder Dairy Farms in Central Uganda. Veterinary Medicine International, Volume 2014, Article ID 169380, 6 p. http://dx.doi.org/10.1155/2014/169380.
Mukassa-Mugerwa, E., Tegegn, A. Mattoin, M. & Cecchini G. (1989). Effect of Estrus Synchronization with Prostaglandin F2α in Ethiopian Highland Zebu (Bos indicus) cows. Animal Production, 48, 367-373.
Mukhtar, M., Salman, D. & Bahua, R. (2019). Effectiveness and Performance of Artificial Insemination Service Units in Supporting Agribusiness Programs and Increasing Beef Cattle Population in Pohuwato Regency. International Journal of Innovative Science and Research Technology, 4(4), 103−110.
Mureda, E. & Mekuriaw, Z. (2007). Reproductive performance of crossbred dairy cows in Eastern Lowlands of Ethiopia. Agricultural College, ATVET, Holleta, Ethiopia.
Negussie, E., Brannang, E., Banjaw, K. & Rottmann, O. U. (1998). Reproductive performance of dairy cattle at Assella livestock farm, Arsi, Ethiopia. I: Indigenous cows versus their F1 crosses. Journal of Animal Breeding and Genetics, 115, 267−280.
Nibret, M. (2012). Study on Reproductive Performance of Crossbred Dairy Cows under Small Holder Conditions in and Around Gondar, North Western Ethiopia. Journal of Reproduction and Infertility, 3 (3), 38−41.
Niraj, K., Alemayehu, E., Berihu, G. & Endale, B. G. (2014). Reproductive performance of indigenous and HF crossbred dairy cows in Gondar, Ethiopia. IOSR Journal of Agriculture and Veterinary Science (IOSR-JAVS), 7(1), 56−61, www.iosrjournals.org.
Niraj, K., Berihu, G., Nigus, A. & Etsay, K. (2017). Performance of Crossbred Dairy Cows under Farmers' Management in and Around Debre Zeit, Ethiopia. Ethiopian Journal of Veterinary Science and Animal Production (EJVSAP), 1(1), 66−72.
Nuraddis, I. & Ahmed, S. (2017). Review on Reproductive Performance of Crossbred Dairy Cattle in Ethiopia. Journal of Reproduction and Infertility, 8(3), 88−94.
Perry, G. A. (2005). Comparison of the efficiency and accuracy of three estrous detection methods to indicate ovulation in beef cattle. South Dakota State University Beef Report, pp. 122−127.
Potdar, V. V., Bhave, K., Gaundare, Y., Awasthi, H. R. & Khadse, J. R. (2016). Factors Influencing Conception Rate of Local and Crossbred Cows. IOSR Journal of Agriculture and Veterinary Science (IOSR-JAVS), 9(10), 51−54.
Rick, R. (2013). Synchronizing Estrus in Beef Cattle. University of Nebraska-Lincoln | Lincoln, NE 68588 | 402−472.
Riyad, J., Anwar, H., Jelalu, K. & Kiros, W. (2017). Assessment on problems associated with artificial insemination service in dairy cattle in Tullo district, West Hararghe, Ethiopia. Ethiopian Veterinary Journal, 21(2), 62−74.
Rodriguez-Martinez, H. (2000). Evaluation of frozen semen: Traditional and new approaches: In the topic of bull fertility. Traditional and new. Chenoweth (Ed.) Topics in Bull Fertility: International Veterinary Information; International Veterinary Information Service, pp. 1.
Schafer, D. W., Brinks, J. S. & Le Fever, D. G. (2007). Increased calf weaning weight and weight via estrus synchronization. Beef Program Report. Colorado State University, 115−124.
Schuller, L. K., Burfeind, O. & Heuwieser, W. (2014). Impact of heat stress on conception rate of dairy cows in the moderate climate considering different temperature humidity index thresholds, periods relative to breeding, and heat load indices. Theriogenology, 81, 1050−1057.
Seblewengel, A., Derese, D. & Wahid, M. A. (2018). Evaluating the Efficiency of Artificial Insemination Following Estrous Synchronization on Cows in Konta, Special Woreda, Southern Ethiopia. Global Veterinaria, 20(4), 181−187.
Sena, T., Guesh, F., Adugnaw, A., Beletech, H. & Workalem, D. (2014). Assessment of Productive and Reproductive Performances of Cross Breed Dairy cows in Debre tabor town, Ethiopia. Journal of Biology, Agriculture and Healthcare, 4, 23, www.iiste.org
Shankar, B., Jotan, K., Arup, S., Nijaya, M. & Sabuj, K. N. (2017). Success of estrus synchronization and artificial insemination in cattle among the NGO supported farmers at Char area in Bangladesh. International Journal of Advanced Research in Biological Sciences, 4(5), 166−170. DOI: http://dx.doi.org/10.22192/ijarbs.2017.04.05.018
Shiferaw, Y., Tenhagn, B. A., Bekana, M. & Kassa, T. (2003). Reproductive performance of crossbred Dairy cows in different production systems in the central Highlands of Ethiopia. Tropical Animal Health Production, 25, 551−561.
Sinishaw, W. (2004). Study on semen quality and field efficiency of AI bulls kept at the National Artificial Insemination Center. MSc. Thesis, Addis Ababa University, Ethiopia.
SPSS (2012). Statistical Package for Social Science (SPSS) software, Version 20.
Suyadi, S., Hakim, L., Wahjuningsih, S. & Nugroho, H. (2014). Reproductive Performance of Peranakan Ongole (PO)- and Limousin x PO Crossbred (Limpo) Cattle at Different Altitude Areas in East Java, Indonesia. Journal of Applied Science and Agriculture, 9(11), 81−85.
Tadesse, B. (2002). Reproductive performances of zebu (Fogera) breed in the central highlands of Ethiopia. DVM. Thesis, Addis Ababa University, Ethiopia.
Tadesse, M., Thiengtham, J., Pinyopummin, A. & Prasanpanich, S. (2010). Productive and reproductive performance of Holstein Friesian dairy cows in Ethiopia. Livestock Research for Rural Development, 22 (2), 21.
Tafari, Y. (2016). A study of level of reproduction of crossbred dairy cows under smallholder condition in Ethiopia. African Journal of Dairy Farming and Milk Production, 3(3), 149−151.
Teddy, M. W. (2017). Hormonal response rate, conception rate and calving rate of cows and heifers in South West Ethiopia. Global Journal of Animal Science, Livestock Production and Animal Breeding, 6 (3), 486−489.
Tesfa, G. (2009). Reproductive performance of indigenous dairy cattle in south Wollo. MSc. Thesis, Mekelle University, Ethiopia. 65 p.
Tesfaye, A., Alemayehu, L., Tefera, Y. & Endris, A. (2015). Factors affecting the reproductive performance of smallholder dairy cows in two regions of Ethiopia. Livestock Research and Rural Development, 27(3), 46. http://www.lrrd.org/lrrd27/3test27046. html.
Tesfay, B., Tsegay, G., Haftu, K., Teferi, A. & Bereket, H. (eds.) (2019). Participatory Agricultural Production Constraints Appraisal: Implication for Research and Development Interventions in Southern, North Western and Western Zones of Tigray. Tigray Agricultural Research Institute and Agricultural Growth Program-II, Proceedings of the Workshop, 09-15 November 2018, Tigray, Ethiopia.
Tegegn, F. & Zelalem, A. (2017). Evaluation of oestrus synchronization and mass artificial insemination service of dairy cattle in Mizan Aman area, Bench Maji zone, South West Ethiopia. International Journal of Livestock Production, 8(1), 1−4. DOI: 10.5897/IJLP2016.0338
Todd, R. (2012). Strategies to improve reproduction during summer, http://www.extension.org/pages/62993/strategies-to-improve-reproduction-during-summer.
Van Pelt, M. L. (2016). Changes in the genetic level and the effects of age at first calving and milk production on survival during the first lactation over the last 25 years. Animal, 2016, 1−8.
Vishwanath, R. (2003). Artificial insemination: the state of the art. Theriogenology, 59, 571−584.
Yifat, D., Kelay, B., Bekana, M., Lobago, F., Gustafsson, H. & Kindahl, H. (2009). Study on reproductive performance of crossbred dairy cattle under smallholder conditions in and around Zeway, Ethiopia. Livestock Research for Rural Development, 21(6).
Shiferaw Y., Tenhagen, B. A., Bekana, M. & Kasa, T. (2003). Reproductive performance of cross bred dairy cows in different production systems in the central highlands of Ethiopia. Tropical Animal Health Production, 25, 551−561.
Downloads
Published
Issue
Section
License
Copyright (c) 2023 TEWELDEMEDHN Mekonnen, LEUL Berhe
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.