Milk Delivery in Tropically-Adapted Neonatal Beef Calves

Genome-wide association studies of female reproduction in tropically adapted beef cattle.

The genetics of reproduction is poorly understood because the heritabilities of traits currently recorded are low. To elucidate the genetics underlying reproduction in beef cattle, we performed a genome-wide association study using the bovine SNP50 chip in 2 tropically adapted beef cattle breeds, Brahman and Tropical Composite. Here we present the results for 3 female reproduction traits: 1) ag...

A Preliminary Estimate of the Heritability of Uterine Cervical Diameter in Tropically Adapted Beef Cattle

Mean uterine cervical diameter, parity and parentage information was recorded from 246 Santa Gertrudis females in southern Queensland. A linear model was fitted to estimate the effects of parity on cervical diameter. The sire variance component was also analysed to provide an estimate of the heritability of cervical size. The effect of parity on cervical size was found to be highly significant ...

Factors Affecting the Production and Reproduction Performance of Tropically Adapted Beef Cattle in Southern Africa

Tick Burdens of Tropically Adapted Beef Cattle as Influenced by Selected Physical and Production Traits

Environmental effects on neonatal mortality of beef calves.

Calving records from 1969 to 1989 from the Roman L. Hruska U.S. Meat Animal Research Center were used to investigate how climatic conditions, in addition to dystocia, age of dam, size of calf, and sex affect calf survival from birth to 1 wk of age. Data were analyzed separately for cows calving with (n = 11,094) or without (n = 72,187) dystocia. Neonatal mortality was described by a logit model...