ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (1): 113-119.doi: 10.11843/j.issn.0366-6964.2016.01.015

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Effects of Rumen-protected Glucose on Performance and Blood Biochemical Parameters during Postpartum Period in Dairy Cows

LI Yan 1,XUE Qian2,GAO Yan-xia2,3,CHEN Zi-ning2,LI Qiu-feng2,3,LI Jian-guo2,3*   

  1. (1.College of Veterinary Medicine,Hebei Agricultural University,Baoding 071001,China;2.College of Animal Science and Technology,Hebei Agricultural University,Baoding 071001,China;3.Embryo Engineering and Technological Center of Cattle and Sheep of Hebei,Baoding 071001,China)
  • Received:2015-06-05 Online:2016-01-23 Published:2016-01-23

Abstract:

This study was conducted to investigate the effects of dietary rumen-protected glucose (RPG) supplementation on performances and blood biochemical parameters of postpartum cows.Twenty-eight healthy postpartum Holstein cows with similar weight and body conditions score were randomly assigned into 4 groups (Ⅰ,Ⅱ,Ⅲ and Ⅳ).The cows in group Ⅳ (the control group) were fed with the basal diet.Except for the same basal diet,the cows in the experimental group Ⅰ,Ⅱand Ⅲ were supplemented with additional 200,300 and 400 g•d-1RPG per cow from the first day of calving.The experiment lasted for 28 days.(1) The postpartum weight loss of the groups Ⅰ,Ⅱ,Ⅲ and Ⅳ were 61.99,43.2,42.83 and 62.66 kg,respectively.Comparing to that of group Ⅳ,postnatal weight loss in groups Ⅱ and Ⅲ were significant less (P<0.01).(2) The milk yield of group Ⅱ and Ⅲ were 26.68 and 26.84 kg•d-1•cow-1,which were significantly higher than that of group Ⅳ (24.49 kg•d-1•cow-1) (P<0.01).The milk yield of group I was at 25.66 kg•d-1•cow-1,which is not significant different from that of group Ⅳ (P>0.05).(3) In comparison with the control,all the experimental groups improved milk protein and lactose content.But the differences among them were not significant (P>0.05).(4) All the experimental groups increased the serum glucose concentration and decreased serum NEFA (nonesterified fatty acids,NEFA) and BHBA (β-hydroxybutyric acid,BHBA) concentration.Especially for group Ⅲ (P<0.01). Our results suggest that in early lactation,diets with RPG can effectively reduce weight loss,increase milk production,increase serum glucose concentration,and decrease serum NEFA and BHBA concentrations.It indicates that RPG supplication can relieve negative energy balance and improve the body conditions of postpartum cows.

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