Effects of Supplemental Feeding with Different Levels of Cysteamine Chelated Zinc on Growth Performance,Digestion and Metabolism of Kazakh Sheep
This experiment was conducted to study the effects of supplemental feeding with different levels of cysteamine chelated zinc(Zn-CS)on the growth performance,digestion and metabolism of Kazakh sheep.Twenty-four healthy Kazakh rams with a body weight of(26.98±1.21)kg aged about 3 months were random-ly divided into 4 groups with 6 rams per group,and each sheep was raised in a single pen.Sheep in control group(CON group)were fed a basal diet,and those in experimental groups were fed 5,10 and 15 mg/kg BW Zn-CS on the basis of feeding the basal diet,and were labeled as 5 Zn-CS group,10 Zn-CS group and 15 Zn-CS group,respectively.The supplemental feeding experiment lasted for 52 days(pre-trial pe-riod was 7 days and experimental period was 45 days).During the experimental period,the feed intake of the sheep was recorded every day,all sheep were weighed once before and at the end of the experiment.Blood was collected from the jugular vein of sheep before morning feeding on the 30th day of the experimental period.On the 31st day,the digestion and metabolism test was conducted for 5 days by total collection feces and urine method.The results showed as follows:1)compared with the CON group,the body weight gain and average daily gain of Kazakh sheep in the 10 Zn-CS group and 15 Zn-CS group were significantly increased(P＜0.05),and the ratio of feed to gain was significantly decreased(P＜0.05).2)The apparent digestibility of crude protein and ether extract in 15 the Zn-CS group was significantly higher than that in the CON group(P＜0.05).3)Nitrogen deposition and nitrogen deposition rate in the 15 Zn-CS group were significantly higher than that in the CON group(P＜0.05);compared with the CON group,the urinary phosphorus in the 5 Zn-CS group,10 Zn-CS group and 15 Zn-CS group was significantly decreased(P＜0.05),and the zinc intake and fecal zinc were significantly increased(P＜0.05);the urinary zinc in the 15 Zn-CS group was significantly lower than that in the 5 Zn-CS group(P＜0.05).4)Compared with the CON group,the plasma somatostatin level in the 15 Zn-CS group was significantly decreased(P＜0.05),and the plasma urea nitrogen content in the 10 Zn-CS group was significantly decreased(P＜0.05).In conclusion,supplemental feeding of Zn-CS can im-prove the growth performance,reduce the level of somatostatin in plasma,and improve the nutrient digestibili-ty of Kazakh sheep.According to the experimental results,the optimal supplemental feeding level of Zn-CS is 15 mg/kg BW.[Chinese Journal of Animal Nutrition,2024,36(9):5837-5847]
cysteamine chelated zincKazakh sheepgrowth performanceplasma hormonedigestion and metabolism
万方数据
维普
