Effects of pelleted total mixed rations with different rumen degradable protein on milk yield and composition of Jonica dairy goat |
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| Institution: | 1. Institute of Animal Nutrition, Nutrition Diseases and Dietetics, University of Leipzig, An den Tierkliniken 9, 04103, Leipzig, Germany;2. Institute of Animal Science, University of Bonn, Endenicher Allee 15, 53115, Bonn, Germany;1. Department of Veterinary Surgery and Radiology, University of Maiduguri, Maiduguri, Borno State, Nigeria;2. Department of Microbiology, University of Maiduguri, Maiduguri, Borno State, Nigeria;3. Department of Veterinary Pathology, University of Maiduguri, Maiduguri, Borno State, Nigeria;1. Department of Nutritional Physiology and Feeding, Athens, Greece;2. Department of Plant Breeding and Biometry, Athens, Greece;3. Laboratory of Dairy Research, Department of Food Science and Human Nutrition, Agricultural University of Athens, Iera Odos 75, GR-11855 Athens, Greece;1. FAO Sub Regional Office for Eastern Africa, Food and Agriculture Organization of the United Nations, United Nations Complex in Nairobi, UN Avenue, Gigiri, Block P, PO Box 30470, 00100, GPO, Nairobi, Kenya;2. Sustainable Bioeconomy, Lammaschgasse 54/7, A-1210, Vienna, Austria;3. FAO Subregional Office for the Gulf Cooperation Council States and Yemen Ministry of Climate Change and Environment Building 4C/4 (P floor), Street No. 6, PO Box 62072, Abu Dhabi, UAE;4. FAO, Viale delle Terme di Caracalla, 00153 Rome, Italy;5. IGAD Center for Pastoral Areas and Livestock Development (ICPALD), PO Box 47824-00100 Nairobi, Kenya |
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| Abstract: | The present study was conducted in order to examine the effects of diets with different ruminal degradable protein sources on the performance of lactating goats fed pelleted total mixed rations (PTMR). Forty multiparous Jonica goats in early-lactation were divided into two equal groups and fed for 135 days the experimental diets. Two types of PTMR were formulated to be isonitrogenous and isocaloric while providing different rumen degradable levels of crude protein: (1) high-degradable protein diet (HD) containing soybean meal, sunflower meal and urea (46% N), and (2) low-degradable protein diet (LD) including only corn gluten meal. Apparent digestibility of the two PTMR was tested using Jonica bucks placed in individual pens and results indicated significant differences (P < 0.05) for crude protein, crude fibre, neutral detergent fibre and acid detergent fibre nutrients’ utilization. In milk performance trial, no significant differences (P > 0.05) were registered in dry matter intake and milk yield. Goats fed LD diet containing corn gluten meal showed the highest milk fat, protein and casein concentration, but not significant differences (P > 0.05) were observed on other milk components and renneting properties. It was concluded that a decrease of rumen degradable protein (RDP) level in PTMR does not negatively influence nutrient utilization and milk production and composition of Jonica dairy goat. |
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