妊娠早期饲粮添加不同水平N-氨甲酰谷氨酸改善母羊产羔性能的研究

doi:10.11843/j.issn.0366-6964.2021.013

Abstract

Abstract: The aim of the present study is to investigate the effects of dietary N-carbamylglutamate (NCG) supplementation on lambing performance and blood indexes of ewes during early pregnancy. A total of 160 second- and third-parity Hu sheep were randomly assigned into 4 groups which fed with basal diet(control group), basal diet supplemented with 0.05%, 0.08% and 0.11%NCG, respectively. Sheep were fed with experimental diets for 40 days from the day of mating. After that, all sheep were fed with basal diet. The parameters of lambing performance were recorded immediately after farrowing. The plasma amino acids, total nitric oxide synthase (TNOS), inducible nitric oxide synthase (iNOS), nitric oxide (NO), growth hormone, estradiol, progesterone, urea and ammonia were detected on the day 0, 20 and 40 of pregnancy. The results showed that the dietary supplementation of 0.08% and 0.11%NCG significantly increased the number of total lambs and total live lambs per litter compared with the control group(P<0.05), but the birth weight of lamb born alive decreased significantly (P<0.05). On day 40 of pregnancy, the plasma concentration of NO in NCG-supplemented groups were significantly higher than that of control group(P<0.05). In addition,compared to control group, 0.11% NCG-supplemented group had higher plasma concentration of iNOS on day 40 of pregnancy (P<0.05), as well as higher plasma concentration of progesterone on day 20 of pregnancy (P<0.05). Moreover, both 0.08% and 0.11% NCG -supplemented groups had lower level of plasma ammonia than those in control group and 0.05% NCG-supplemented group on day 20 of pregnancy (P<0.05), and on day 40 of pregnancy the plasma ammonia in 0.11% NCG-supplemented group was significantly lower than that of control group (P<0.05). The results suggested that dietary NCG supplementation during the early stage of pregnancy increased plasma concentration of iNOS, NO and progesterone, and thus improved placental nutrition and pregnancy maintenance. The reduced plasma concentration of ammonia by NCG supplementation, may improve the lambing performance by optimizing the uterine environment and enhancing fetal developmental potential.

Key words: N-carbamylglutamate, multiparous ewes, lambing performance, blood indexes

CLC Number:

S814
S816.79

CAI Yuan, TIAN Jianhui, WANG Dong, LUO Yuzhu, WENG Shiqiao, LI Chunyang. Effects of Dietary N-carbamylglutamate Supplementation on Improving Lambing Performance of Ewes during Early Pregnancy[J]. Acta Veterinaria et Zootechnica Sinica, 2021, 52(1): 126-134.

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Effects of Dietary N-carbamylglutamate Supplementation on Improving Lambing Performance of Ewes during Early Pregnancy

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