BODY-WEIGHT, BODY CONDITION SCORE, AND WITHER HEIGHT OF PREPARTUM HOLSTEIN COWS AND BIRTH-WEIGHT AND SEX OF CALVES BY PARITY - A DATABASE AND SUMMARY

Measurements of body weight (BW), body condition score, wither height, calf birth weight, and calf sex were recorded by parity from 728 Hols tein cows and heifers at the Purina Research Center during the 8-wk pr epartum period. Data were compiled over 5 yr. Mean daily BW gain was 0 .93 kg. Loss of BW at parturition was 11.1%. Mean body condition score was 3.35 (five-point scale where 1 = thin to 5 = obese) and did not c hange during the 8-wk period. However, body condition score was lower for second parity cows than for heifers or cows in third or greater pa rity. Wither height averaged 138 cm at first parity and increased 3 cm from first to second parity. During fifth and sixth parities, wither height peaked at an additional 2 to 3 cm. Birth weights for all calves averaged 41.4 kg. Male calves were 8.5% heavier than female calves. C alves born to cows in second or greater parity had increased BW by 7 t o 8%. Mean BW of twin calves was 15% less than that of single calves.