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- W1966382219 abstract "ABSTRACT The performance of 200 F 1 Friesian ♂ × zebu ♀ and 90 zebu heifers on 14 dairy cooperative farms near Addis Ababa was compared over a 2-year period. The farms varied in management and feeding but in general the standards were low. Each farm had zebu and Friesian × zebu cows given the same management and feeding. Measurements were made of milk production traits of economic importance, including physiological and behavioural factors important for management purposes. The Friesian ♂ × zebu ♀ crossbred heifers showed an advantage in having an earlier age at puberty and at first calving, higher milk production, longer lactations, better disposition at milking and better reproductive performance. The calves from these crossbred heifers were larger at birth but there were more problems at calving. The zebu heifers withstood better the two periods of drought that occurred during the study. No significant differences were found in disease incidence, parasitic resistance, mastitis incidence or mortality. The interval between oestrus was normal in the F 1 heifers but longer in the zebus. The duration of gestation was much longer in the zebus (mean 291 days). The duration of oestrus was 4·5 h for the zebu and 10·0 h for the F 1 heifers, the latter being-much longer than the mean of 7·4 h reported in the literature. The F 1 heifers showed the first oestrus after calving much sooner than did the zebus." @default.
- W1966382219 created "2016-06-24" @default.
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- W1966382219 date "1983-10-01" @default.
- W1966382219 modified "2023-09-25" @default.
- W1966382219 title "Comparative performance of F<sub>1</sub>Friesian × Zebu heifers in Ethiopia" @default.
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- W1966382219 doi "https://doi.org/10.1017/s0003356100001793" @default.
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