Effects of Different Dietary Energy and Protein Levels on Milk Production in Saanen Dairy Goats in Mid Lactation
2010
Park, J.K., Hankyong National University, Ansung, Republic of Korea | Kim, J.D., Cheonan Yonam College, Cheonan, Republic of Korea | Kim, J.A., Hankyong National University, Ansung, Republic of Korea | Yoo, J.S., Hankyong National University, Ansung, Republic of Korea | Bae, G.S., Chung-Ang University, Ansung, Republic of Korea | Kim, C.H., Hankyong National University, Ansung, Republic of Korea
The study was conducted to investigate the effect of dietary energy and protein levels on milk production in Saanen (Capra hircus) dairy goats fed the diets with the different ratio of forage and concentrate. Four lactating goats in mid lactation (57.5±10.79 kg BW) were used in a 4 × 4 Latin square with 21-d periods. Animals were randomly allocated to one of the four groups; 10.59 MJ ME/kg and 11.90% CP (T1), 10.14 MJ ME/kg and 12.73% CP (T2), 9.45 MJ ME/kg and 15.19% CP (T3), 8.75 MJ ME/kg and 16.60% CP DM (T4). Also ratio of forage to concentrate was 49 : 51 (T1), 59 : 41 (T2), 74 : 26 (T3) and 90 : 10 (T4). Intakes of forage and concentrate were linearly increased (p less than 0.05) with their increasing energy levels in the diets. No significant differences were found in total dry matter intake and body weight between treatments. Milk yield in T3 was the highest among treatments (p less than 0.05). Relative to other treatments, T4 significantly (p less than 0.05) decreased the content of milk fat. The yields of milk protein and lactose in T1 (61.29 and 70.95 g/d) and T3 (60.52 and 75.82 g/d) were significantly higher (p less than 0.05) than T2 (50.49 and 59.64 g/d) and T4 (52.49 and 59.82 g/d). This study suggested that the minimum dietary level of energy and protein was 9 MJ ME/kg and 15% CP in mid lactation Saanen dairy goats.
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