Journal of Animal Health and Production

Research Article
J. Anim. Health Prod. 7(4): 158-165
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Suntorn Wittayakun*, W. Innaree, S. Innaree, W. Chainetr, N. Kongngoen

Department of Animal Science and Fishery, Faculty of Science and Agricultural Technology, Rajamangala University of Technology Lanna, Lampang Campus, 200 Mu 17 Pichai District, Muang, Lampang, 52000.Thailand.

Abstract | This study evaluated the effects of crude protein (CP) to metabolizable energy (ME) ratio on responses of heifers fed pineapple waste silage-based diets. Three Holstein heifers were assigned in a 3x3 Latin square design with three of a 20-days period and allocated to one of three diets: T1, 40.17:1 g/Mcal CP:ME ratio; T2, 49.68:1 g/Mcal CP:ME ratio and T3, 56.92:1 g/Mcal CP:ME ratio. The CP:ME ratios were adjusted by altering the CP content (9.18, 10.54, and 12.17%CP) with ME (2.32, 2.24 and 2.15 Mcal/kgDM), respectively. Diets were formulated to provide 0.50 kg/day of the expected average daily gain and comprised 50% of pineapple waste silage in dry matter (DM) basis. Daily DM intake was not affected by elevated CP:ME ratios (P = 0.914). However, CP intake as expressed in g/kgDM increased linearly when CP:ME ratios increased (P = 0.001). In addition, CP intake was the highest for heifers consuming T3 diet. No treatment effect was detected on intake of ME per kgDM (P = 0.974), net energy for maintenance (NEM) per kgDM (P = 0.741), and net energy for growth (NEG) per kgDM (P = 0.970). As the CP:ME ratio was increased, rumen fermentation parameters, plasma metabolites and thyroid hormones did not significantly altered (P>0.05). These results suggest that feeding of CP:ME ratio at 56.92:1 g/Mcal would be a better practice of dietary CP and ME in diets based on pineapple waste silage to maintain feed efficiency of Holstein heifer at 0.50 kg/day of the expected average daily gain.

Keywords | Protein, Energy, Pineapple, Dairy, Heifer