Performance of crosses among Hereford, Angus and Simmental cattle with different levels of Simmental breeding: VI. maternal heterosis of 3- to 8-year-old dams and the dominance model

Article Abstract:

A study conducted on dams of different cross breeds indicated that dominance model can be used for predicting the outcome of the various systems of cross breeding. Information from Hereford, 25% Hereford-75% Simmental, 50% Hereford-50% Simmental and 75% Simmental-25% Hereford dams, was analyzed to determine the efficiency of dominance model in explaining differences among different cattle breeds and estimating maternal heterosis. Maternal heterosis was found to exert an important influence on productive traits of beef cattle and reproduction and milk production in cows.

Influence, Heterosis, Hereford cattle

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Prediction of fertility from calfhood traits of Angus and Simmental heifers

Article Abstract:

A study on Angus and Simmental heifers indicated that fertility rates can be predicted on the basis of age at onset of the first breeding season for Angus heifers and growth parameters in the case of the Simmental heifers. Logistic regression technique was used to quantify the influence of characteristics, such as birth weight, weaning weight and relative growth rate (RGR), on incidence of heifer pregnancy. Results revealed that a combined analysis of birth date and RGR could serve as a reliable predictor of fertility for the two breeds.

Sexual behavior, Statistics, Heifers, Aberdeen-Angus cattle, Aberdeen Angus cattle

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Influence of calving season and stocking rate on birth weight and weaning weight of Simmental-sired calves from Brahman-Hereford F1 dams

Article Abstract:

Data collected over a 15-year span was used to determine the effects of calving season and stocking rate on the birth and weaning weights of beef cattle. Analysis was done both across and within seasons to determine specific effects of the various interactions. Heavier birth weights for spring-born calves and heavier weaning weights for fall-born calves were noted and attributed to the higher quality of cold-season forage. Low stocking rates produced heavier calves at both age points, regardless of season.

Cattle breeding

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