Restricted Feeding of Ensiled Crop Residue on Production and Economic Cost in Dairy Replacement Heifer
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This study aimed to investigate the effect of restricted feeding of ensiled crop residue (ECR) on dairy replacement production and economic cost. The completely randomized design was employed on 87.50-93.25% Holstein Friesian crossbred dairy replacement female from 63 heifers and divided into 3 groups each of 21 animals. The initial body weights of all heifers averaged 288.95 ± 10.54 kilograms and final weight averaged of 320.39 ± 3.11 kilograms under 90 days feeding period. There were 3 groups were fed with corn by-products silage, rice straw and concentrate at 10, 3 and 3 kg/head/day (T1; Control group), ECR, rice straw and concentrate at 8, 2 and 3 kg/head/day (T2) and ECR and concentrate at 14 and 2 kg/head/day (T3). All heifers received concentrate with 14 %CP throughout the period of the study. The result showed that heifers in 3 groups had no difference in body weight changes and average daily gain. The body condition score change of heifer in group 3 had higher (0.64 ± 0.03) than those in groups 1 and 2 (P<0.01). Total dry matter intake and total dry matter intake of protein in all groups were significantly (P<0.01). The apparent digestibility of nutrient of the three groups were in the same levels (P>0.05). Heifer in group 3 had higher digestible energy, metabolizable energy and total digestible nutrient (P>0.05). Blood glucose, blood urea nitrogen and triiodothyronine found to be in normal range (P>0.05). The total production costs per head of the 3 groups found to be 17,277.14 ± 59.20, 17,512.55 ± 59.49 and 18,109.66 ± 58.89 baht/head (P<0.01) and total production costs per weight gain of group 3 lower than those in group 2.
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