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第五届中国畜牧科技论坛

作者： J.H.Wang C.C.Wu J.Feng Laboratory of Medicinal Chemistry Department of Bioengineering CollegeChongqing University

The objective of this study was to evaluate the effect of dietary supplementation of antibacterial peptide and zinc-methionine on performance and some serum biochemical parameters of weaned piglets. Rongchang male piglets(28 days of age,initial weight 8.4±0.65 Kg) were *** piglets were randomly allotted to four diets including the control group,the antibacterial peptide(AP) group containing 10 mg AP/kg diet, the zinc-methionine(Zn-Met) group with 1200 Zn-Met/kg diets(equal to 200mg Zn/kg diets),the Zn/AP group containing 10mg AP and 1200mg Zn-Met/kg diet,respectively,in a 4-week feeding *** of these groups consisted of six replications with 8 pigs per *** ADG and ADFI all improved for the AP group(P0.05,Pserum TP and serum HDL for the control showed regularity during the *** results indicated that AP and ZnMet were effective in improving growth performance and some serum parameters levels of weaned piglets.

关键词： Antibacterial peptide Zinc Methionine Weaned piglet Performance serum parameters

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The Effect of Yucca schidigera Extract on Ruminal Fermentation and parameters Traits in Sheep

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Agricultural Sciences in China 2007年第1期6卷 121-128页

作者： LIU Chun-long LI Zhong-qiu DU Juan SHAN An-shan Animal Nutrition Institute Northeast Agricultural University Harbin 150030 P.R.China Northeast Institute of Geography and Agricultural Ecology Chinese Academy of Sciences Harbin 150080 P.R.China Department of Animal Science Research Heilongjiang Academy of Agricultural Sciences Harbin 150086 P.R. China

In a completely randomized block design experiment, 16 ruminally cannulated sheep （40 ±2.1 kg）fed a 50% concentrate： 50% forage diet （DM basis） were given intraruminal doses of powdered Yucca schidigera extract （YSE）. Doses of 0 （control）, 100, 200, or 300 mg kg^-1 diet were given at 8 p.m. and 4 a.m. On 15, 16, and 17 d of the experimental period, ruminal contents were sampled 0, 2, 4, 6, and 8 h after dosing, and blood samples were collected at the end of the experiment （18th and 19th d）. Acidity was not affected （P〉0.05） by the addition of YSE. Compared with the control, ruminal propionate concentration was increased by 29.4 and 29.8% （P〉 0.05） and the acetic acid concentration was decreased by 15.1 and 19.8% （P〉0.05） at 4 and 6 h after YSE （300 mg kg^-1） dosing, respectively. Ruminal ammonia concentration in the first 2 h after feeding was higher （P〈0.05） in the sheep that did not receive YSE （increased by 17.57 mg 100 mL^-1） than in those that received 200 mg kg^-1（increased by 6.77 mg 100 mL^-1） or 300 mg kg^-1 （increased by 6.50 mg 100 mL^-1） YSE. Protozoan populations in the rumen were lower （P〈0.05） in the animals that received 300 mg kg^-1 of YSE compared with the control. All serum parameters of the four groups were in the normal range and were similar among the treatment groups （P 〉 0.05）, after being fed for 19 d with different doses of YSE. The effect of YSE on ruminal ammonia concentration likely resulted from a decreased concentration of protozoan populations and, presumably, from ammonia binding by YSE.

关键词： Yucca schidigera extract rumen fermentation protozoan populations serum parameters sheep

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