Effects of Pelleted Total Mixed Rations with Different Protein Levels on Growth and Development, Hematological Indexes and Serum Enzyme Activities of Weaned Donkey Foals
ZHANG Shimin, ZHANG Guiguo, ZHANG Chongyu
College of Animal Science and Technology, Shandong Agricultural University, Key Laboratory of Animal Biological Engineering and Disease Control in Shandong Province, Tai'an 271018, China
Abstract：The purpose of this experiment was to research the effects of pelleted total mixed rations with different protein levels on growth and development, hematological indexes and serum enzyme activities of weaned donkey foals. Thirty donkey foals aged 5 to 6 months and weighted (88.21±5.79) kg in good condition were selected and randomly divided into three groups (each group had 10 head), and fed three pelleted total mixed rations which had the similar digestible energy level and protein level of 12.10% (trial group Ⅰ), 13.95% (trial group Ⅱ) and 15.87% (trial group Ⅲ), respectively. The experimental period was 70 days, the first 10 days was the adaptation period, and the later 60 days was the formal trial period. For the formal trial period, the first 31 days was early trial period, and the latter 29 days was the later trial period. The results showed as follows:1) at the early trial period, the average daily gain of groups Ⅰ and Ⅲ was significantly higher than those of group Ⅱ (P<0.05). At the later trial period, the average daily gain and average daily feed intake of groups Ⅱ and Ⅲ were significantly higher than those of group Ⅰ (P<0.05). 2) At the later trial period, the body length index of group Ⅰ was significantly higher than that of groups Ⅱ and Ⅲ (P<0.05); the body structure index of group Ⅱ was significantly higher than that of group Ⅰ (P<0.05). 3) At the early trial period, the lymphocyte number and intermediate cell number of group Ⅱ were significantly lower than those of groups Ⅰ and Ⅲ (P<0.05); the hematocrit of groups Ⅰ and Ⅱ was significantly higher than that of group Ⅲ (P<0.05). At the later trial period, the white blood cell number, lymphocyte number and intermediate cell number of group Ⅰ were significantly higher than that of groups Ⅱ and Ⅲ (P<0.05); the hemoglobin content and hematocrit of group Ⅲ were significantly higher than those of group Ⅰ (P<0.05). 4) At the early trial period, the activities of alanine aminotransferase and alkaline phosphatase in serum of groups Ⅰ and Ⅲ were significantly higher than those in group Ⅱ (P<0.05). At the later trial period, the activity of alanine aminotransferase in serum of group Ⅱ was significantly higher than that of groups Ⅰ and Ⅲ (P<0.05); the activity of alkaline phosphatase in serum of group Ⅲ was significantly higher than that of group Ⅱ (P<0.05). In conclusion, under this experiment conditions, the pelleted total mixed ration with the protein level of 12.10% can meet the requirements of normal growth and body measurement development of weaned donkey foals, and it also can maintain a higher immunity and the optimal serum enzyme activities.
张士敏, 张桂国, 张崇玉. 不同蛋白质水平的全混合颗粒饲料对断奶驴驹生长发育、血液学指标及血清酶活性的影响[J]. 动物营养学报, 2019, 31(8): 3664-3673.
ZHANG Shimin, ZHANG Guiguo, ZHANG Chongyu. Effects of Pelleted Total Mixed Rations with Different Protein Levels on Growth and Development, Hematological Indexes and Serum Enzyme Activities of Weaned Donkey Foals. Chinese Journal of Animal Nutrition, 2019, 31(8): 3664-3673.
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