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The experiment was to investigate the effect of N-carbamylglutamate on reproductive performance, serum indexes and hormone secretion of cows. Sixty Angus cows with similar weight, parity and expected delivery were randomly divided into four groups with 15 cows in each group, one cow per replicate. The control group was basal diet, and each cow in test group 1, group 2 and group 3 were fed with basal diet supplemented with 10, 20 and 30 g/(head·d) of NCG, respectively. The experiment lasted for 120 d. The results showed that after cows delivery, the content of GLU and NO of cows in test group 3 were significantly higher than control group (P<0.05), the content of Arg of cows in test group 2 and group 3 were significantly higher than control group (P<0.05), and the content of P of cows in test group 2 were significantly higher than control group (P<0.05),while the content of E2 of cows in test group 3 were significantly lower than control group (P<0.05). Before cows breeding, the content of serum BUN of cows in test group 2 and group 3 were significantly lower than control group (P<0.05), while the content of GLU in test group 2 was significantly higher than control group (P<0.05), the content of Arg and NO in all the test groups were significantly higher than control group (P<0.05), the content of serum E2 in test group 3 was significantly higher than control group (P<0.05). The content of serum P in test group 2 and group 3 were significantly lower than control group (P<0.05). The estrus mating rates of cows in test group 2 and group 3 were higher than control group, and the conception rates of experimental groups were higher than that in control group, but the first postpartum mating days in test group 2 and group 3 were significantly lower than control group (P<0.05). The results indicates that the NCG can improve body metabolism, promote the secretion of reproduction-related hormones, and improve the reproductive performance of breeding cows, and the appropriate supplemental level is 20 and 30 g/(head·d). [ABSTRACT FROM AUTHOR]

The experiment was conducted to investigate the effect of dietary NCG supplementation on growth performance, serum biochemical indexes and immune indexes of calves in Angus cows during late gestation. Sixty cows in late gestation period with similar weight parity and expected perinatal period were randomly divided into four groups with 15 cows in each group. Cows in control group were fed with a basal diet, cows in experimental groups were fed wtih basal diet supplemented with 10, 20 and 30 g/(head·d) NCG, respectively. The corresponding calves in each group were denoted as group 1, group 2 and group 3, respectively. The experiment starts from 4 w before delivery of cows and ends at 90 d of age of calves. The results showed that compared with control group, the birth weight of calves in group 3 was significantly higher than that in control group (P<0.05). Compared with control group, the contents of TP, ALB and NO in serum of newborn calves in group 3 were significantly increased (P<0.05), and the content of IgA, IgG and IgM in serum were significantly increased (P<0.05). The experiment indicates that the addition of NCG of 30 g/(head·d) to diet of cows in late gestation period can significantly increase birth weight, increase erum protein content of newborn calves, improve immune function, but these effects were lost at 90 days of age. [ABSTRACT FROM AUTHOR]

[Objectives] The purpose of this experiment was to investigate the effects of dietary supplementation of N-carbamylglutamate(NCG)or taurine(Tau)on reproductive performance, serum antioxidant indices, immunoglobulin levels of sows and the growth performance of piglets. [Methods] Forty-eight Danbred Landrace sows with similar body condition and parity were assigned randomly into 3 groups:control group(basal diet), NCG group(basal diet with 500 mg·kg-1 NCG)and Tau group(basal diet with 600 mg·kg-1 Tau), respectively. The experiment was carried on sows from 35 days of gestation to weaning at 26-day-age of piglets. [Results]1)Compared with the control group, both dietary NCG and Tau supplementation increased the number of heavier piglets(P<0.05), however, no significant difference was found between NCG group and Tau group(P>0.05). 2)Supplementation with dietary NCG and Tau showed a significant increase in piglet vitality(P<0.05); meanwhile, NCG group showed a remarkable decrease in duration of parturition(P<0.05). 3)Compared with the control group and NCG group, dietary supplemented with Tau significantly increased the average daily feed intake(ADFI)of the sows 5 days after delivery(P<0.05), while compared with the control group and Tau group, dietary NCG supplementation significantly increased the ADFI of sows during lactation(P<0.05), and enhanced the activity of superoxide dismutase(SOD)(P<0.05). Meanwhile, compared with control group, the activity of serum glutathione peroxidase(GPx)in NCG and Tau groups increased by 0.41% and 0.03% respectively, the malondialdehyde(MDA)content decreased by 0.43% and 1.71%respectively, but there was no statistical difference(P>0.05). 4)Both NCG and Tau supplementation tended to increase serum IgG(P=0.06)and IgM levels(P=0.07). 5)Compared with the control group and the Tau group, the supplementation with NCG significantly increased the average daily weight gain and average body weight of the weaned piglets(P<0.05); compared with the control group, the supplementation with Tau had no significant effect on the growth performance of the piglets(P>0.05). [Conclusions] Dietary supplemented with 500 mg·kg-1 NCG or 600 mg·kg-1 Tau could increase the number of heavier piglets and enhance the piglets' vitality, and NCG group showed a better efficiency than Tau group. Meanwhile, the supplementation with NCG can also shorten the duration of parturition, improve the feed intake of the sow during lactation period and the growth performance of weaned piglets. The mechanism of this action might be related to the fact that NCG could improve the antioxidant level and immune function of sows. [ABSTRACT FROM AUTHOR]

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