INCREASED WEIGHT-GAIN AND EFFECTS ON PRODUCTION PARAMETERS OF HOLSTEIN HEIFER CALVES THAT WERE ALLOWED TO SUCKLE FROM BIRTH TO 6 WEEKS OF AGE

Forty Holstein heifer calves were assigned to two treatments. Control calves (n = 20) were fed milk replacer in open buckets, and calves tha t were allowed to suckle (n = 20) were paired and suckled the same dam three times daily. Treatments were conducted during the first 6 wk fo llowing birth; thereafter, all calves received the same management, an d weaning was at 60 d of age. During treatment, calves that were allow ed to suckle had significantly higher average daily gains than did con trol calves. However, at 12 wk of age, calves that were allowed to suc kle had significantly lower body weights (BW) than did control calves. Age at conception was significantly lower, and BW at conception and c onception rate tended to be higher, for calves that were allowed to su ckle. Calving age was significantly earlier for heifers that had been allowed to suckle as calves, and BW at calving also tended to be highe r. Height at the withers after calving was also significantly higher f or those heifers. Milk production during first lactation tended to be higher for the heifers that had been allowed to suckle as calves. Our results indicated that heifer calves that suckled milk during the firs t 42 d of age had higher average daily gains, higher height at the wit hers, an earlier age at calving, and a tendency for greater milk produ ction than did calves fed milk replacer.