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Effects of stocking density on oxidative stress status and mammary gland permeability in early lactating dairy cows
Author(s) -
Lin Shixin,
Liu Jianxin,
Wang Kaiying,
Wang Diming
Publication year - 2019
Publication title -
animal science journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.606
H-Index - 38
eISSN - 1740-0929
pISSN - 1344-3941
DOI - 10.1111/asj.13206
Subject(s) - mammary gland , somatic cell count , zoology , lactation , dairy cattle , insulin , prolactin , oxidative stress , colostrum , endocrinology , medicine , biology , hormone , ice calving , pregnancy , immunology , cancer , breast cancer , genetics , antibody
The current study was conducted to investigate the effect of stocking density ( SD ) on oxidative stress status and mammary gland permeability in early lactating dairy cows. Thirty‐two dairy cows were allocated into 16 blocks, basing on parity, previous milk yield, and body weight, and were then randomly assigned into one of the two treatments as follows: 75% (75 SD ) and 100% (100 SD ) SD . The cows were fed with same diet throughout the 8‐week experimental period. The milk yield and milk sample were collected on two consecutive days during the 8‐week experimental period weekly. Plasma samples were collected on fourth and eighth experimental weeks. Raw, energy‐corrected, and 4% fat‐corrected milk yield were significantly higher in 75 SD ‐cows than that of 100 SD ‐animals, respectively. The milk somatic cell count was lower in 75 SD ‐cows than that of 100 SD ‐animals. The levels of Na + , Na + /K + , bovine serum albumin and plasmin were lower in 75 SD ‐cows than those of 100 SD ‐cattle, respectively. The 75 SD ‐cows had reduced insulin and insulin/glucagon levels but higher prolactin and growth hormone concentrations, compared with those of 100 SD ‐animals, respectively. In conclusion, compared with low SD ‐animals, early lactating cows with higher SD had higher oxidative stress status, which further led to a greater mammary gland permeability.