Effects of Inactivated Yeast Culture on Rumen Fermentation and Performance of Mid-Lactation Dairy Cows

被引:0
作者
Fortina, R. [1 ]
Battaglini, L. M. [1 ]
Opsi, F. [1 ]
Tassone, S. [1 ]
Renna, M. [1 ]
Mimosi, A. [1 ]
机构
[1] Univ Turin, Dipartimento Sci Zootecn, I-10095 Grugliasco, Italy
来源
JOURNAL OF ANIMAL AND VETERINARY ADVANCES | 2011年 / 10卷 / 05期
关键词
Yeast culture; rumen fermentation; microbial ATP; milk production; rumen fluid; Italy; SACCHAROMYCES-CEREVISIAE; RUMINAL FERMENTATION; EARLY-LACTATION; NUTRIENT DIGESTIBILITY; FEED-EFFICIENCY; MILK-PRODUCTION; SUPPLEMENT; COMPONENTS; DIETS; YIELD;
D O I
暂无
中图分类号
S85 [动物医学(兽医学)];
学科分类号
0906 ;
摘要
The aim of this study was to evaluate the effect of daily supplementation of a devitalized strain of Saccharomyces cerevisiae on milk yield and composition of Friesian-Holstein lactating cows. Average Days In Milk (DIM) and Body Weight (BW) of cows were 98+/-24 days and 619+/-13.2 kg. Prior to the experiment, the effects of the yeast culture added to the diet were investigated in 2 in vitro experiments. In the first experiment, 6 samples of rumen fluid were used to determine the DM, CP and NDF degradability (IVDMD, IVCPD, IVNDFD) of Total Mixed Ration (TMR) at 0 and 48 h with the addition of 0 g (Y(0)) and 1 g (Y(1)) of yeast culture. In the second experiment, free, total and microbial ATP production were used for the evaluation of microbial activity in rumen fluids after 0, 8, 24 and 48 h incubation. In the 4 weeks trial, 10 multiparous cows were assigned to a Control diet (C) and 10 to the experimental diet (YC = C+35 g/cow/day of yeast culture). TMR on a Dry Matter (DM) basis consisted of corn silage (42.3%), ryegrass hay (14.1%), corn meal (22.1%), soybean meal (17.9%) and a mineral/vitamins mix (3.6%). Crude Protein (CP) and ENI were 14.6% and 1.56 Mcal kg(-1) DM, respectively. Cows were individually fed once daily and milked at 7 and 19 h. In vitro experiments showed that the addition of 1 g YC to the rumen fluid increased IVCPD and IVNDFD after 48 h of incubation but did not influence IVDMD. Free, total and microbial ATP values showed a continuous decrease during the 48 h of the trial but the addition of YC proved to be effective in slowing the decrease. Milk yield (31.9 and 33.4 kg day(-1), for the C and YC group), 4% fat corrected milk (FCM: 30.3 and 31.7 kg day(-1)) and energy corrected milk (ECM: 32.9 and 34.5 kg day(-1)) were significantly different between groups. Dry Matter Intake (DIVE), milk fat and protein percentage were similar in both groups. Feed efficiency (ECM kg(-1) DMI) was higher in YC group than in C.
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页码:577 / 580
页数:4
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