Article Abstract:
Periodic measurements show that calf plasma cholesterol is more closely related to milkfat intake rather than to total milk intake up until weaning time. Thyroxine treatment decreased cow plasma cholesterol for two sampling periods. Breed group affected cow plasma cholesterol, being higher in crossbred cows. Plasma cholesterol did not affect milk yield, but yield was decreased by thyroxine treatment and influenced by breed. Growth was not influenced by either cow or calf cholesterol level, but was affected by breed and milk intake. Correlations within the cow and calf cholesterol levels averaged 0.65.
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Article Abstract:
A prediction of milk expected progeny differences (EPD) of Polled Hereford sires was matched against actual milk production of their crossbreed daughters. A correlation value of 0.26 was obtained based on the accuracy of the prediction, heritability of the trait and relationship between sire and daughter. These findings show that actual milk production can be predicted by EPD and can be used in genetic manipulations to improve production.
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Article Abstract:
The effects of maternal heterosis of Hereford, Brangus, and reciprocal crossbred cows were evaluated based on their performance and production records under semidesert conditions. The progeny of either Brangus sires or dams exhibited superior qualities compared to those of the Hereford variety. The straightbred Hereford cattle were consistently the poorest and least efficient producers. Weaning fewer kilograms as a percentage of body wei
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