不同中短链与长链脂肪酸比例对围产期母牛能量代谢及犊牛健康的影响OA

The experiment aimed to investigate the effects of different ratios of short and medium-chain fatty acids(SMCFA)to long-chain fatty acids(LCFA)on the energy metabolism of pregnant cows and the health of their calves during postpartum period.Forty periparturient Angus cows with similar body condition,parity,and gestational age were randomly divided into four groups,with 10 replicates per group and one cow per replicate.The control group(group D)was fed a basal diet,while the experimental groups were fed the basal diet supplemented with 40 g/d LCFA(group A),20 g/d SMCFA+20 g/d LCFA(group B),and 40 g/d SMCFA(group C),respectively.The pre-test period was 10 days,and the formal test period was 30 days.The results showed that compared with group D,the final body weight of cows in all experimental groups was extremely increased(P<0.01),the milk fat and lactose concentrations in both colostrum and mature milk of all experimental groups were significantly or extremely increased(P<0.05 or P<0.01).Compared with group D,the serum concentrations of glucose(GLU),insulin(INS),and growth hormone(GH)in all experimental groups were extremely increased(P<0.01).The body weight and body size parameters of calves in all experimental groups were generally superior to those in group D,with the height at the hip cross and heart girth in groups B and C being significantly higher than those in group D(P<0.05).The serum levels of total protein(TP),GLU,immunoglobulin G(IgG),interleukin-4(IL-4),total antioxidant capacity(T-AOC),and superoxide dismutase(SOD)in calves of the experimental groups were significantly higher than those in group D(P<0.05),while glutathione peroxidase(GSH-Px)activity was extremely higher than that in group D(P<0.01),and tumor necrosis factor-α(TNF-α)content was significantly lower than that in group D(P<0.05).The study shows that supplementation with appropriate ratios of SMCFA and LCFA in the diet of periparturient Angus cows can improve maternal energy metabolism,reduce body weight loss,enhance milk quality,promote calf growth and development,and improve immune function and antioxidant capacity.Among them,the effect of adding 20 g/d SMCFA+20 g/d LCFA is better.