Effects of Different Concentrate to Roughage Ratios of Total Mixed Pellet Diet on Nutrient Apparent Digestibility, Nitrogen Metabolism and Energy Metabolism of Ewes

WANG Wenqi, HOU Guangtian, LUO Yongming, LIU Yanfeng, KA Nati

doi:10.3969/j.issn.1006-267x.2014.11.018

2014 , Vol. 26 >Issue 11: 3316 - 3324

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.11.018

Ruminant Nutrition

Effects of Different Concentrate to Roughage Ratios of Total Mixed Pellet Diet on Nutrient Apparent Digestibility, Nitrogen Metabolism and Energy Metabolism of Ewes

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1. Feed Research Institute, Xinjiang Academy of Animal Science, Urumqi 830000, China;
2. Xinjiang Laboratory of Animal Biotechnology, Urumqi 830000, China;
3. Animal Science Institute, Xinjiang Academy of Animal Science, Urumqi 830000, China

Received date: 2014-05-05

Online published: 2014-11-17

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Abstract

This experiment was conducted to investigate the effects of different concentrate to roughage ratios of total mixed pellet diet (TMPD) on nutrient apparent digestibility, nitrogen metabolism and energy metabolism of ewes, and to determine dietary optimal concentrate to roughage ratio [or neutral detergent fiber (NDF) level] of ewes. Thirty healthy crossbred ewes (Suffolk sheep×Aletai sheep) aged 8 months with similar body weight were randomly assigned to six treatments with five sheep in each treatment by a single factor completely randomized block design. Ewes in different treatments were fed TMPDs with six concentrate to roughage ratios, which were 85:15, 70:30, 55:45, 40:60, 25:75 and 10:90, respectively. The pre-test lasted for 10 days, the digestion and metabolism test lasted for 18 days, and the respiratory calorimetry test lasted for 2 days. The results showed as follows: 1) the effects of concentrate to roughage ratio of TMPD on the apparent digestibility of dry matter (DM), organic matter (OM) and NDF were significant (P<0.01). The apparent digestibility of DM and OM were increased with the increasing of concentrate to roughage ratio. The apparent digestibility of NDF was highest in diet with concentrate to roughage ratio of 55:45, which was not significantly from diets with concentrate to roughage ratios of 85:15 and 70:30 (P>0.05). 2) Digestible nitrogen was increased with the increasing of concentrate to roughage ratio, too high or too low concentrate to roughage ratio were not conducive to nitrogen retention, and nitrogen efficiency was highest when concentrate to roughage ratio was 55:45. 3) The digestive energy, metabolizable energy, gross energy digestibility and gross energy metabolic rate were significantly increased with the increasing of concentrate to roughage ratio (P<0.01). Under the experimental condition, ewes have higher digestion and absorption of TMPDs with concentrate to roughage ratios of 70:30 and 55:45 (NDF levels are 37.78% and 45.80%, respectively).

Key words： total mixed pellet diet; ewe; apparent digestibility; nitrogen metabolism; energy metabolism

Cite this article

WANG Wenqi, HOU Guangtian, LUO Yongming, LIU Yanfeng, KA Nati . Effects of Different Concentrate to Roughage Ratios of Total Mixed Pellet Diet on Nutrient Apparent Digestibility, Nitrogen Metabolism and Energy Metabolism of Ewes[J]. Chinese Journal of Animal Nutrition, 2014 , 26(11) : 3316 -3324 . DOI: 10.3969/j.issn.1006-267x.2014.11.018

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