Species and Zein Content of Corn：Effects on Ruminal Starch Degradation Rate in Goats

ZHANG Xia; SUN Haizhou; ZHAO Cunfa; LI Shengli; SANG Dan; YAN Cheng; WANG Meixiu

doi:10.3969/j.issn.1006-267x.2014.03.031

Chinese Journal of Animal Nutrition >

2014 , Vol. 26 >Issue 3: 783 - 791

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.03.031

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Species and Zein Content of Corn：Effects on Ruminal Starch Degradation Rate in Goats

ZHANG Xia ,
SUN Haizhou ,
ZHAO Cunfa ,
LI Shengli ,
SANG Dan ,
YAN Cheng ,
WANG Meixiu

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1. College of Animal Sciences, Inner Mongolia Agricultural University, Hohhot 010018, China;
2. Institute of Animal Nutrition and Feed, Inner Mongolia Acadamy of Agricultural & Animal Husbandry Sciences, Hohhot 010031, China;
3. The Supervision and Inspection of Forage Grass in Ordos of Inner Mongolia, Ordos 017010, China

Received date: 2013-09-01

Online published: 2014-03-04

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Abstract

This experimental was conducted to research the effects of different species and zein content of corn for feeding on ruminal starch degradation rate in goats. Zein content of 8 representative species of corn grains in Inner Mongolia region (Jiulong No. 10, Jiulong No. 15, Denghai 3672, Defeng 359, Jingdan 38, Fengtian No. 6, Zhongxing 2255 and Fuer 306) was determined by nephelometry method, and ruminal starch degradation rate and 7 h in vitro starch degradation rate (7 h IVSD) in goats were determined by nylon bag and in vitro methods, respectively. The results showed as follows: 1) Jingdan 58 had the lowest zein content[(3.09±0.36)%], and the highest ruminal starch efficient degradation rate[when outflow rate constant (K_p)=6%/h, (43.11±0.04)%, when K_p=4%/h,(49.33±0.07)%] and 7 h IVSD[(62.08±1.24)%]; meanwhile, Defeng 359 had the highest zein content[(6.04±0.32)%], and the lowest ruminal starch efficient degradation rate [when K_p=6%/h, (35.91±0.03)%; when K_p=4%/h, (39.64±0.05)%] and 7 h IVSD[(52.93±0.42)%]. 2) Corn zein content had a significantly negative relationship with 7 h IVSD (R²=0.89, P<0.01), and had a significantly negative relationship with ruminal starch efficient degradation rate (when K_p=6%/h, R²=0.82, P<0.01; when K_p=4%/h, R²=0.83, P<0.01). 3) Zein (A) and starch contents of corn (B) had a significant regression relationship with 7 h IVSD (Y)[Y(%)=58.73+0.19B-2.68A(R²=0.94,P<0.01)], and had a significant regression relationship with ruminal starch efficient degradation rate[Y₆' (%)=47.84+0.04B-2.43A (when K_p=6%/h, R²=0.82, P<0.05); Y₄' (%)=55.99+0.04B-3.29A (when K_p=4%/h,R²=0.83, P<0.05). In conclusion, in order to improve feeding value and save costs of corn, it is very important to control the effects of species and zein content of corn on the total digestive tract starch degradation rate in ruminants from the whole process from planting to feeding.

Key words： goat; zein; 7 h in vitro starch degradation rate

Cite this article

ZHANG Xia , SUN Haizhou , ZHAO Cunfa , LI Shengli , SANG Dan , YAN Cheng , WANG Meixiu . Species and Zein Content of Corn：Effects on Ruminal Starch Degradation Rate in Goats[J]. Chinese Journal of Animal Nutrition, 2014 , 26(3) : 783 -791 . DOI: 10.3969/j.issn.1006-267x.2014.03.031

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