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Effects of Forage Feeding Levels on the Udder Volume, Serum Hormone Level and Lactation Characteristics in Dairy Cows: From Growing to Lactating Phase
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 Title & Authors
Effects of Forage Feeding Levels on the Udder Volume, Serum Hormone Level and Lactation Characteristics in Dairy Cows: From Growing to Lactating Phase
Lee, Byung-Woo; Sugathan, Subi; Singh, Naresh Kumar; Yoon, Sei-Hyung; Yoon, Byung-Il;
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 Abstract
In the present study, we investigated the effects of high forage diets on the volume of udder, hormone level in blood, and lactation characteristics in the Holstein dairy cow. We divided into two groups; high forage diet [HF, concentrate: forage=4:6 n=41] and low forage diet [LF, 6:4 n=21]. Five cows were selected from each group based on their age for measuring the udder volume and the serum levels of estradiol and progesterone. Lactation characteristics were compared between HF and LF. The udder volume was 2.5 fold larger in HF at early gestation (p<0.01), but no difference was noted afterward. For the hormone levels, no significant difference was found between the groups. In HF, milk yield was significantly increased and maintained high longer, while somatic cell count was approximately 50% lower. Meanwhile, the milk fat content was significantly lower in HF during early lactating phase (p<0.001), but there was no difference thereafter. For milk protein and solid content, and MUN, no differences were found between the groups during lactation. Our results indicated that feeding high forage diets to dairy cows can increase milk yield and quality without notable changes in the udder volume and hormone level.
 Keywords
Holstein dairy cow;High forage diet;Estradiol;Progesterone;Milk yield;
 Language
Korean
 Cited by
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