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Effects of Daily Gain in Pre and Postpubertal Replacement Dairy Heifers on Body Condition Score, Body Size, Metabolic Profile, and Future Milk Production1

Effects of Daily Gain in Pre and Postpubertal Replacement Dairy Heifers on Body Condition Score, Body Size, Metabolic Profile, and Future Milk Product

Effects of Daily Gain in Pre and Postpubertal Replacement Dairy Heifers on Body Condition Score, Body Size, Metabolic Profile, and Future Milk Production1   (Citations: 18)
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Two trials were conducted to evaluate the effect of moderate (0.7 kg) and accelerated (0.9 kg) average daily gain before (trial 1) and after (trial 2) puberty on body condition, metabolic profile, and first lactation milk pro- duction of Italian Holstein-Friesian heifers. There were 20 heifers in trial 1 and 22 in trial 2. Trials started when heifers averaged 150 and 300 kg of body weight in trial 1 and 2, respectively, and lasted 7 mo (experi- mental period). Across diet groups, half of the heifers were mated at first estrus after 370 kg and the other half after 420 kg of body weight gain. Actual average daily gains were 0.667 and 0.775 kg in trial 1 and 0.748 and 0.824 kg in trial 2 for moderate and accelerated experimental groups, respectively. Diets for high aver- age daily gain did not affect body condition during grow- ing phase in trial 1, whereas it did in trial 2. High average daily gain increased plasma glucose in trial 1 and plasma urea concentration in trial 2. Rearing diet did not affect milk production and milk protein percent- age in both trials. High average daily gain decreased milk fat percentage in trial 2. Early calving negatively influenced milk production in both trials and milk fat percentage in trial 1. Early calving heifers showed higher protein percentage than those with late calving
Journal: Journal of Dairy Science - J DAIRY SCI , vol. 83, no. 7, pp. 1468-1478, 2000
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    • ...The majority of reported results of experiments addressing this problem concern Holstein-Friesian heifers (Pirlo et al., 1997; Van Amburgh et al., 1998; Abeni et al., 2000; Silva et al., 2002)...
    • ...A similar tendency of HF heifers fed during pre-puberty rations with 10-15% higher net energy and crude protein levels compared with ones fed according to NRC (1989) standards established for 700 g/day body gain was reported by Daccaret et al. (1993), Pirlo et al. (1997), Van Amburgh et al. (1998) and Abeni et al. (2000)...

    J. Strzetelskiet al. The effect of pre- and post-pubertal feeding levels on the growth, rep...

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