Effects of Guanidine Acetic Acid,Saccharomyces cerevisiae and Cellulase Complex on Growth Performance,Digestion and Metabolism,Slaughter Performance and Meat Quality of Mutton Sheep
This experiment was conducted to investigate the effects of dietary supplemented with guanidine ace-tic acid(GAA),Saccharomyces cerevisiae and cellulase complex(SCC)on growth performance,digestion and metabolism,slaughter performance,meat quality and economic benefit of mutton sheep.A 3×2(GAA× SCC)completely randomized trial design was adopted with GAA supplemental levels of 0,0.03％and 0.06％and SCC supplemental levels of 0 and 0.01％based on dietary dry matter weight.Seventy-two weaned and cas-trated Texel×Dolper hybrid rams were randomly divided into 6 groups with 3 replicates per group and 4 sheep per replicate.After the pretest period of 7 days,it entered the trial period of 60 days.The results showed as fol-lows:1)compared with non-added GAA and SCC,dietary supplemented with 0.06％GAA or 0.01％SCC significantly increased the average daily gain(P＜0.05),and significantly decreased the feed to gain ratio(P＜0.05).GAA and SCC had significant interaction effects on the average daily gain and feed to gain ratio(P＜0.05).2)Compared with non-added GAA and SCC,dietary supplemented with 0.06％GAA significantly in-creased the nitrogen apparent digestibility and nitrogen deposition rate(P＜0.05),and significantly decreased the fecal nitrogen(P＜0.05);dietary supplemented with 0.01％SCC significantly increased the apparent di-gestibility of nitrogen,neutral detergent fiber and acid detergent fiber and nitrogen deposition rate(P＜0.05),and significantly decreased the fecal nitrogen(P＜0.05).The interaction of GAA and SCC had significant effects on the nitrogen apparent digestibility,nitrogen deposition rate and fecal nitrogen(P＜0.05).3)Com-pared with non-added GAA and SCC,dietary supplemented with 0.06％GAA significantly increased the car-cass weight and eye muscle area(P＜0.05),while dietary supplemented with 0.01％SCC only significantly in-creased the carcass weight(P＜0.05).GAA and SCC had significant interaction effects on the carcass weight and eye muscle area(P＜0.05).4)Compared with non-added GAA and SCC,dietary supplemented with 0.06％GAA or 0.01％SCC significantly increased the spleen index(P＜0.05).GAA and SCC had no signifi-cant interaction effect on the organ indexes(P＞0.05).5)Compared with non-added GAA and SCC,dietary supplemented with 0.06％GAA significantly increased the pH24h,lightness for 45 min(L*45min)value and lightness for 24 h(L*24h)value of longissimus dorsi muscle(P＜0.05),and significantly decreased the drip loss(P＜0.05);dietary supplemented with 0.01％SCC significantly increased the L*45min value and L*24h value of longissimus dorsi muscle(P＜0.05).GAA and SCC had significant interaction effects on the pH24h,L*45min value,L*24h value and drip loss(P＜0.05).6)Compared with non-added GAA and SCC,dietary supplemen-ted with 0.06％GAA or 0.01％SCC significantly increased the muscle crude protein content(P＜0.05).GAA and SCC had a significant interaction effect on muscle crude protein content(P＜0.05).7)Dietary supplemen-ted with 0.06％GAA or 0.01％SCC and the interaction between GAA and SCC had significant effects on the additive cost,drug cost and net income(P＜0.05),and the highest net income was found when both 0.06％GAA and 0.01％SCC were added.In conclusion,under the conditions of this experiment,considering all as-pects of performance,dietary simultaneously supplemented with 0.06％GAA and 0.01％SCC can more effec-tively improve the growth and slaughter performance of mutton sheep,promote their growth and development,and improve the nitrogen apparent digestibility,spleen index,muscle quality and economic benefit.[Chinese Journal of Animal Nutrition,2024,36(7):4428-4446]
guanidine acetic acidSaccharomyces cerevisiae and cellulase complexgrowth performancedi-gestion and metabolismslaughter performancemeat qualityeconomic benefit
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