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- W116536491 abstract "Milk yield of Brahman cows in a tropical beef production system in Venezuela was estimated during 2 years. In trial A, 2,054 valid observations were taken by the calf nursing (weigh-suckle-weigh) technique using 6-hr experimental intervals on 8 monthly test days during each of 285 lactations. The least squares model included the following effects on 6-hr milk yield: incidence of urination and/or defecation by calf (U, coded 0 or 1), incidence of rainfall beginning during the nursing period (R, coded 0 or 1), year and sire of calf; partial regressions of length of test period (T), age of calf, calf weight, cow weight loss from calving to the respective test day, mean maximum temperature and total amount of rainfall during 14 days preceding test day, and linear, quadratic and cubic effects of test day number. All effects were significant, except total rainfall and year. Mean estimated 6-hr milk yield corrected for U, R and T was 1.55 kg, resulting in 24-hr milk yield of 6.2 kg and total estimated production of 1,340 kg during a 216-day lactation. The lactation curve peaked in the second month. In trial B, the milk yield of 19 cows previously included in trial A was estimated by hand milking after oxytocin injection and compared to that obtained by calf nursing with and without subsequent hand milking after oxytocin injection. Milk yield obtained by hand milking was 29% lower (P<.05) than estimated by the calf nursing method. Notable amounts of milk were extracted after nursing only when calves were 3 to 10 days old." @default.
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- W116536491 date "1979-01-01" @default.
- W116536491 modified "2023-10-01" @default.
- W116536491 title "Milk Yield of Brahman Cows in a Tropical Beef Production System" @default.
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- W116536491 doi "https://doi.org/10.2527/jas1979.4811" @default.
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