. Agri-news. Agriculture. 2 December 11, 1978 FOR IMMEDIATE RELEASE LARGE CALVES, SMALL COW PELVIC AREA MAIN CAUSES OF CALVING TROUBLES It comes as no surprise to cattlemen that the combination of a small cow sired to a large bull will likely give the cow problems at calving time. Research at South Dakota State University (SDSU) has been zeroing in on exactly what causes those difficulties. Hopefully, it will turn up information that cow-calf producers can use to select the kind of yearling heifer that will give them a good sized calf at weaning time with a reduced amount of calving difficulty
. Agri-news. Agriculture. 2 December 11, 1978 FOR IMMEDIATE RELEASE LARGE CALVES, SMALL COW PELVIC AREA MAIN CAUSES OF CALVING TROUBLES It comes as no surprise to cattlemen that the combination of a small cow sired to a large bull will likely give the cow problems at calving time. Research at South Dakota State University (SDSU) has been zeroing in on exactly what causes those difficulties. Hopefully, it will turn up information that cow-calf producers can use to select the kind of yearling heifer that will give them a good sized calf at weaning time with a reduced amount of calving difficulty. Over a four-year period, the research shows that calf birth weight and cow pelvic area are the two most consistently important factors influencing calving difficulty in two-year-olds. Over 550 Hereford, Hereford-Angus cross, Simmental-Angus cross, and Sim- mental-Hereford cross heifers were involved. A total of 52 different factors were investigated to determine their influence on calving difficulty. The factors studied during the period from the weaned heifer calf through the calving of the two-year-old cow included periodic heifer weights, condition scores and rate of gain. Three internal and seven external pelvic areas were also measured. So were three pelvic angle measurements and two slope of rump estimates obtained as yearlings and as two-year- olds. Other factors taken into account include gestation length and calf birth weight, sex and birth date. Cows were scored on difficulty of delivery. Internal pelvic measurements were taken to estimate the size of the cow's birth canal. External pelvic measurements were obtained to determine if they could be used to pre- dict internal pelvic size. Slope of rump and pelvic angles were calculated to study their effects on pelvic size and calving difficulty. Results from computer analyses showed some difference between breeds of heifers and sires of calves. However, when the data were analyzed within breeds, the calf birth - (cont'
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Keywords: ., bo, bookcentury1900, booksubjectagriculture, bookyear1978, septdec
