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- W2024379488 abstract "Data collected over a 10-yr period on 1,778 service intervals in 1,111 Arsi (Bos indicus), cows at the Ethiopian Ministry of Agriculture ranch were analyzed. Conception rate to first service was 48%, cows calving from June to February being more likely to conceive at first oestrus. Overall interval between services in animals returning for insemination averaged 53 +/- 40 (SD), range 6-262 d. There were (6%) short cycles of less than 17 d, mostly during the first (69%) and second (30%) intervals (P less than 0.01). A quarter of service periods (24%) were within the normal length of 18-24 d, 52% were its multiples while 18% were abnormal and probably indicative of embryonic mortality. First oestrus cycle length was affected by year (P less than 0.01) and season of calving (P less than 0.05). Second oestrus cycle length was influenced by season of calving and first oestrus onset (P less than 0.05). It is concluded that the low frequency of normal cycles is to a large extent due to heats which remained undetected by visual observation in Arsi cows under artificial insemination programmes." @default.
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- W2024379488 date "1991-01-01" @default.
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- W2024379488 title "Characterization of service intervals and frequency of short oestrus cycles in Zebu (Bos indicus) cows in Ethiopia" @default.
- W2024379488 doi "https://doi.org/10.1051/rnd:19910402" @default.
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