Effects of Graded Abomasal Starch Infusion on Feed Intake, Lactation Performance, Gastrointestinal Fermentation and Blood Metabolism of Lactating Cows

ZOU Yang; LI Shengli; CAO Zhijun; YANG Zhanshan

doi:10.3969/j.issn.1006-267x.2014.06.006

2014 , Vol. 26 >Issue 6: 1467 - 1476

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.06.006

Ruminant Nutrition

Effects of Graded Abomasal Starch Infusion on Feed Intake, Lactation Performance, Gastrointestinal Fermentation and Blood Metabolism of Lactating Cows

ZOU Yang ,
LI Shengli ,
CAO Zhijun ,
YANG Zhanshan

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State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China

Received date: 2013-12-01

Online published: 2014-05-30

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Abstract

This experiment was performed to assess the effects of infusion of graded starch in abomasum on feed intake, lactation performance, gastrointestinal fermentation and blood metabolism of lactating cows. Four Holstein cows fitted with permanent ruminal cannulas were arranged into four groups by a 4×4 Latin square design. Cows were infused with 0, 800, 1 600 and 2 400 g/d starch in abomasum, respectively. The experiment lasted for 7 days, which was consisted of a 5-day pre-experimental period and a 2-day experimental period. The results showed as follows: 1) dry matter intake of dairy cows was not affected by abomasal starch infusion at different levels (P>0.05); with the increase of abomasal starch infusion level, digestive energy intake (P=0.022) and net energy for lactation intake (P=0.014) were linearly increased, while starch apparent digestibility was linearly decreased (P=0.029). 2) With the increase of abomasal starch infusion level, milk fat percentage (P=0.024) and yield (P=0.022) were quadratically increased, those in 1 600 g/d group reached the highest. 3) Butyric acid concentration in fecal fluid in 800 g/d group was significantly lower than that in 1 600 and 2 400 g/d groups (P0.05). In conclusion, milk fat percentage is quadratically increased with the increase of abomasal starch infusion level, and the peak amount of rumen escaped starch that can be utilized by dairy cows at late lactation period is 1 600 g/d.

Key words： starch infusion; feed intake; lactation performance; blood metabolism; lactating cows

Cite this article

ZOU Yang , LI Shengli , CAO Zhijun , YANG Zhanshan . Effects of Graded Abomasal Starch Infusion on Feed Intake, Lactation Performance, Gastrointestinal Fermentation and Blood Metabolism of Lactating Cows[J]. Chinese Journal of Animal Nutrition, 2014 , 26(6) : 1467 -1476 . DOI: 10.3969/j.issn.1006-267x.2014.06.006

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