Effects of peanut seedling silage on growth performance,immunity and meat quality of mutton sheep
This experiment was conducted to study the effects of peanut seedling silage on growth performance,immunity and meat quality of mutton sheep.A total of 60 healthy mutton sheep with similar body weight were randomly divided into four groups with 15 replicates per group and one sheep per replicate.The mutton sheep in the control group were fed corn stalk silage as roughage,and peanut seedling silage was used to replace 25%(trial group A),50%(trial group B)and 100%(trial group C)corn stalk silage in experimental groups,respectively.The pre-test period was one week and the formal test period was eight weeks.The results showed that compared with the control group,the final weight and average daily gain of mutton sheep in trial groups B and C were significantly increased(P<0.05),and the ratio of feed to gain was significantly decreased(P<0.05).Compared with the control group,the serum immunoglobulin A(IgA)and interleukin-10(IL-10)levels of mutton sheep in trial groups B and C were significantly increased(P<0.05),the levels of interleukin-6(IL-6),interleukin-1β(IL-1β)and tumor necrosis factor-α(TNF-α)were significantly decreased(P<0.05),and the CD4+content and CD4+/CD8+ratio were significantly increased(P<0.05).Compared with the control group,the pH value and redness value of muscle in trial groups B and C were significantly increased(P<0.05),while the drip loss,brightness value and yellowness value were significantly decreased(P<0.05).The shear force of all trial groups was significantly decreased(P<0.05).Compared with the control group,the contents of palmitic acid and saturated fatty acid in muscle of trial groups B and C were significantly decreased(P<0.05),while the contents of erucic acid and monounsaturated fatty acid were significantly increased(P<0.05).Oleic acid content and ω-6/ω-3 ratio in muscle of mutton sheep in all experimental groups were increased(P<0.05).The study indicates that peanut seedling silage can improve the growth performance,immunity and mutton quality,peanut seedling silage can replace 50%and 100%corn straw silage effectively.
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