Effects of Feeding Level on Digestion and Metabolism of Meat Ewes during Pregnancy

LOU Can; JIANG Chenggang; MA Tao; JI Shoukun; CHEN Dandan; TU Yan; DENG Kaidong; ZHANG Naifeng; DIAO Qiyu

doi:10.3969/j.issn.1006-267x.2014.01.018

Chinese Journal of Animal Nutrition >

2014 , Vol. 26 >Issue 1: 134 - 143

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.01.018

Ruminant Nutrition

Effects of Feeding Level on Digestion and Metabolism of Meat Ewes during Pregnancy

LOU Can ,
JIANG Chenggang ,
MA Tao ,
JI Shoukun ,
CHEN Dandan ,
TU Yan ,
DENG Kaidong ,
ZHANG Naifeng ,
DIAO Qiyu

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Key Laboratory of Feed Biotechnology of Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China

Received date: 2013-07-31

Online published: 2013-12-24

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Abstract

This experiment was conducted to investigate the regularity of digestion and metabolism of main nutrients in Dorper×Thin-Tailed Han crossbred ewes during pregnancy under different feeding levels. Fifteen pregnant ewes were assigned into three groups according to body weight utilizing randomized block design, in which ewes were fed under conditions of ad libitum, 80% and 60% dietary restriction, with five replicates in each group and one ewe per replicate. Digestive and respiratory trials were performed at 40, 100 and 130 days of pregnancy, respectively, to determine digestive and metabolic parameters of main nutrients. The results showed as follows: 1) with the increase of feeding level, the apparent digestibility of dry matter (DM), organic matter (OM), neutral detergent fiber (NDF), acid detergent fiber (ADF) and nitrogen and total energy digestibility of pregnant ewes was decreased, but the differences were not significant (P>0.05), except the apparent digestibility of NDF and ADF in 60% dietary restriction group was significantly higher than that in ad libitum group at 100 days of pregnancy (P<0.05). Nutrients digestion and fecal output, urinary nitrogen and urinary energy at 100 and 130 days of pregnancy were significantly affected by feeding level (P<0.05), and the changing tendency was in accordance with feeding level. 2) With the increase of days of pregnancy, ewes' nutrient intakes were reduced, the apparent digestibility was increased, and ewes in 60% dietary restriction group were in negative nitrogen balance; with the increase of days of pregnancy, methane energy proportion in gross energy was increased, which was 6.83% to 7.13%, 10.91% to 11.15% and 6.83% to 12.53% at 40, 100 and 130 days of pregnancy, respectively; metabolic energy/digestive energy at 40 days of pregnancy (87.10% to 88.76%) was significantly higher than that at 100 (75.48% to 77.59%) and 130 days of pregnancy (76.31% to 79.03%). In conclusion, pregnancy can affect nutrients digestion, nitrogen digestion and deposition, methane emission and energy metabolism.

Key words： meat ewes; pregnant ewes; digestion and metabolism; energy; protein

Cite this article

LOU Can , JIANG Chenggang , MA Tao , JI Shoukun , CHEN Dandan , TU Yan , DENG Kaidong , ZHANG Naifeng , DIAO Qiyu . Effects of Feeding Level on Digestion and Metabolism of Meat Ewes during Pregnancy[J]. Chinese Journal of Animal Nutrition, 2014 , 26(1) : 134 -143 . DOI: 10.3969/j.issn.1006-267x.2014.01.018

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