Study on reproductive performance of Holstein-Friesian dairy cows at Alage Dairy Farm, Rift Valley of Ethiopia
Tropical Animal Health and Production
Alage Agricultural Technical Vocational and Educational Training College, Ministry of Agriculture and Rural Development, Zeway 78, Ethiopia; Aklilu Lemma Institute of Pathobiology, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia; School of Veterinary Medicine, Addis Ababa University, P.O. Box 34, Debre Zeit, Ethiopia
A retrospective study was carried out to evaluate the reproductive performance of Holstein-Friesian cattle in Alage Dairy Farm in the Rift Valley of Ethiopia using data recorded from July 1983 to June 2005. Data of cows with complete information were considered, and a total of 1,104 records for calving to conception (Cal-Con), calving interval (CI), and number of services per conception (NSC), and 721 records for age at first service (AFS) and at first calving (AFC) were analyzed. The overall means (±S. E.) of AFS, AFC, Cal-Con and CI, and NSC were 991.4 ± 24.3, 1,265 ± 24.3, 285.8 ± 18.9, 561.3 ± 18.9 days and 1.69 ± 0.1, respectively. Parity significantly influenced NSC, Cal-Con, and CI. Season and year showed a significant effect on all the parameters, indicating the role of the environment and more specifically the influence of nutritional conditions at least for the long AFS and AFC, management practices, and climate on reproductive performance of the study herd. A more focused study to discern the elements of the reproductive constraints have been recommended. © 2010 Springer Science+Business Media B.V.
animal; animal husbandry; article; cattle; Ethiopia; female; methodology; physiology; pregnancy; regression analysis; reproduction; retrospective study; season; tropic climate; Animal Husbandry; Animals; Cattle; Ethiopia; Female; Least-Squares Analysis; Pregnancy; Reproduction; Retrospective Studies; Seasons; Tropical Climate; Bos; Friesia