Pelvic area, calving ease and rebreeding in first calf heifers

Changes in Pelvic Area and Cervical Dilation near Parturition in Brahman Cows and First-calf Heifers

Calving day and age at first calving in Angus heifers.

Because of difficulties in data collection and analysis, in most breeds there have been limited ways to evaluate fertility in females on a between-herd basis. The objective of this study was to determine the heritabilities (direct and maternal) for CD (calving day) and AFC (age at first calving) in American Angus heifers and to evaluate the potential for using these traits in genetic improvemen...

Management of First-Calf Heifers

first-calf heifers presents one of the greatest challenges to cow-calf producers. The physical and nutritional stresses associated with parturition, lactation and continuing her own growth, create a real challenge for the two-yearold cow. Calving difficulties, weak calves, calf death loss and scours are all potential pitfalls that can be avoided or reduced with proper management and nutrition. ...

Calving and calving management of beef cows and heifers on cow-calf operations in the United States.

A national sample of cow-calf producers was contacted to participate in a study to describe selected calving management practices on operations throughout the United States. Information was gathered on calving season, frequency of dystocia, frequency of observation, timing of assistance, and calving facilities. Regional and herd size differences existed in all parameters evaluated. Most calves ...

Genetic parameters for growth, reproductive performance, calving ease and suckling performance in beef cattle heifers

There is considerable concern about the consequences on fitness-related traits of using narrow breeding objectives for production traits. The aim of this study was to assess the potential consequences of selection for growth in French beef cattle breeds by estimating genetic correlations between growth, reproduction, calving and suckling traits of Charolais, Limousin and Blonde d’Aquitaine heif...