| At present the industry of rabbit feeding face so many problems such as thesingle kind of forage grass, the low benefit of economic and the low use ratio offorage grass. To explore the suitable addition amount of methionine which is the firstrestrict amino acid for fur animals. And the suitable addition amount of methioninenot only can meet the nutritional needs but also can improve the quality of the fur,reduce the investment cost and improve the benefit of economic. The trial selected60rabbit which are45days old. And the rabbit divided into5groups,the group I togroup V were added0.00%,0.15%,0.3%,0.45%,0.6%methionine in the basal diet.After7d pre-feeding period, enter the90d formal trial period. By comparing theaverage daily gain, Feed/gain, TP in blood serum, BUN, the area of skin, number ofhair follicles, the primary follicles/stimulate hair follicles, the length of the coat wool,Hcy in blood serum and the CβS mRNA expression in liver. Results are as bellow:The effects of dietary methionine supplemented levels on average daily gain,Feed/gain: After90d of feeding, average daily gain of group V was significant lowerthan group II（P<0.05）and extreme significant lower than the group III (P<0.01）,other groups were no significant difference (P>0.05). Feed/gain of V group wassignificant lower than the group I and group IV (P<0.05) and extreme significantlower than the group II and group III (P<0.01), other groups were no significantdifference.The effects of dietary methionine supplemented levels on TP and BUN inblood serum:In this experiment TP in blood serum had no significant difference ineach group (P>0.05). But basal diet was added different levels of methionine hadsignificant influence on BUN (P<0.05). The BUN of group III was significantlower than that of group I, IV, V（P<0.05）. Other groups were no significantdifference but the content of BUN increased first and then decreased with theincreasing of methionine. The effects of dietary methionine supplemented levels on number of hair follicles and the primary follicles/stimulate hair follicles: The numberof hair follicles and the primary follicles were no significant difference. But theprimary follicles/stimulate hair follicles of group V was significant differencebetween group III and group （IP<0.05）. Other groups were no significant difference（P>0.05）. The effects of dietary methionine supplemented levels on the length ofthe coat wool and the area of skin: The area of skin of group III was significantdifference between group I（P<0.05）and extreme significant difference betweengroup III （P<0.01）. The area of skin of group III increased by14.9%than group Iand increased by18.3%than group III. Other groups were no significant difference（P>0.05）. The effects of dietary methionine supplemented levels on the Hcy inblood serum: After90d of feeding the Hcy in blood serum of group III was extremesignificant difference between group V（P<0.01）. And Hcy in blood serum of groupV was significant difference between group I, II, IV（P<0.05）. The effects of dietarymethionine supplemented levels on the CβS mRNA expression in liver: The CβSmRNA expression in liver of group V was lowes. And the CβS mRNA expression inliver of group V was significant lower than group II and group III（P<0.05）. Othergroups were no significant difference（P>0.05）. Conclusion: A moderate amount ofincrease of methionine content in the feed can significant improve the growthperformance and feed conversion ration, reduce the content of BUN in serum of rexrabbit. A moderate amount of increase of methionine content in the feed can alsoimprove the quality of fur and the CβS mRNA expression in liver of rex rabbit. Sothat it can explain the effect of the content of methionine on its own metabolicpathways in the way of molecular. But methionine as the strongest toxicity in20amino acid which can compound protein. It content in the feed is not the more thebetter. When the methionine add too much it can reduce the growth performance andproduction performance of rex rabbit. |
PDF Full Text Request