A 3-yr study was conducted with spring-born heifers (n = 240) to determine the effects of developing heifers to either 55 or 60% of mature BW at breeding on reproduction and calf production responses. A concurrent study was also conducted with summer-born heifers (n = 146) to examine effects of breeding heifers with the mature cow herd or 1 mo earlier on reproduction and calf production variabl...

This experiment compared growth, body composition, plasma IGF-I and leptin, and reproductive development of beef heifers receiving or not recombinant bovine ST (BST) beginning after weaning until the first breeding season. Fifty Angus × Hereford heifers (initial BW = 219 ± 2 kg; initial age = 208 ± 2 d), weaned at approximately 6 mo of age, were assigned to the experiment (d 0 to 210). On d 0, ...

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Pneumonia is the second most common health problem in young calves, after diarrhea. Respiratory infections include all diseases affecting the entire respiratory tract. In contrast, pneumonia is a term that describes inflammation of the lungs only. Pneumonia is a disease that may vary from subclinical to acute and fatal. Depending on the severity of the infection, damage to the lungs can be temp...

Abstract Fetal loss occurs in 4 to 13% of dairy cattle worldwide with a subsequent $487 $1900 economic per pregnancy. Previous studies have identified SNPs associated fetal loss, but few investigated haplotypes (DNA that segregates offspring together) loss. The objective this study was identify Holstein heifers and cows conceived the first insemination. This consisted 529 (470 maintained pregna...

Dystocia considers one of the most common obstetrical problems in cattle, especially heifers; current study achieved to demonstrate Dystocia's impact on viability fetus heifers and cows. The involved 15 multiparous cows aged 3-7 years 10 these animals suffered abnormality calving. showed higher significantly (P≤0.01) (60%) than (40%) also, rate difficult male birth was greater 7 (70%) female we...