日粮中添加不同比例棉副产品对绵羊生产性能、营养物质消化率及血液生化指标的影响

doi:10.16431/j.cnki.1671-7236.2016.12.015

Abstract

Abstract:

The study was conducted to determine the effects of different dietary cotton by-products levels on production performance,nutrient digestibility and blood biochemical indexes of sheep.30 healthy sheep were chosen and randomly divided into 5 groups with 6 sheep per group. The feed of each group was that 50% formula concentrate feed was mixed with 50% wheat straw (control group),25% wheat straw and 25% cotton stalk (group Ⅰ),50% cotton stalk (group Ⅱ),45% cotton stalk and 5% cotton seed (group Ⅲ),and 40% cotton stalk and 10% cotton seed(group Ⅳ), respectively. The experiment lasted for 60 d. The result showed that:① The total weight gain and ADG of sheep showed a decreased with the increase of cotton stalk added proportion in the diets, and the total weight gain and ADG of group Ⅱ were significantly lower than group Ⅲ (P<0.05).② The concentration of NH₃-N was increased or decreased at different levels after adding different proportions of cotton by-products,and the TVFA and propionic acid concentration were not significantly affected (P>0.05).③ There was no significant difference of intake nitrogen, fecal nutrogen and uninary nitrogen among groups (P>0.05),but apparent digestibility of NDF and ADF showed a downward trend with the increase of cotton by-products added proportion in the diets,which were extremely significantly lower than control group (P<0.01).④ There were no significant differences among groups of the blood white cell count,red cell count,hemoglobin concentration,total protein,albumin,globulin,serum iron,sodium,chlorine and potassium content (P>0.05),but serum magnesium was significantly increased with increases of gossypol content in the diets (P<0.05). In conclusion,when the cotton by-products addition level in diets reaches 50% caused the free gossypol concentration in the feed more than 300 mg/kg, it would has certain negative effects on the production performance and health of sheep,and the cotton stalks add ratio in the diet should be controlled in the range of lower than 25%.

Key words: cotton by-products; sheep; production performance; nutrient digestibility; blood biochemical indexes

CLC Number:

S816.5

Halidai·Rehemujiang, WANG Yong-li, Maierhaba·Abudounaibi, Aibibula·Yimamu. Effects of Different Dietary Cotton by-products Levels on Production Performance, Nutrient Digestibility and Blood Biochemical Indexes of Sheep[J]. , 2016, 43(12): 3184-3192.

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Effects of Different Dietary Cotton by-products Levels on Production Performance, Nutrient Digestibility and Blood Biochemical Indexes of Sheep

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