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1 Department of Animal Science, Cornell University, Ithaca, NY 14853
Fifty-six cull Holstein dairy cows with various body condition scores were followed to slaughter. prior to slaughter, cows were weighed on a digital scale, hook to hook and hook to pin dimensions were measured, and age was estimated by dentition. Twenty-four hours after slaughter, 9th to 11th rib sections were collected and weighed, and bone-free tissue was dissected and weighed. Deboned tissue was freeze-dried, ground, and analyzed for DM, ether extract, CP, and ash. One unit increase of body condition change was associated with a change of 56 kg live weight and 12.65% ether extract and –12.20% CP. Tissue DM increased by 7.23% per unit of body condition increase, largely due to increase in the percentage of ether extract. Regression of composition on body condition score revealed r2 of .69 for DM, .61 for CP, and .57 for ether extract. Body condition score is highly correlated with composition of the 9th to 11th rib tissue.
Key Words: body condition score • dairy • cows • rib composition
Submitted on July 20, 1990
Accepted on September 24, 1990
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