Effects Of Dietary Energy Levels And Sources On Mink(Mustelidae Vison) Production Performance, Nutrient Digestion And Metabolism

This research was designed to study effects of dietary energy levels and energy sources onproduction performance, nutrition digestion of mink kits. The main research of this thesis is toknowledge the effects of dietary energy levels and source on mink production performance, nutrientdigestion and metabolism. Animal nutritional indicators, serum biochemical indicators and productiveperformance were measured and analyzed in search for the optimum dietary erengy levels and erengysources with best dietary formulation productive performance to provide a scientific basis for theestablishment of mink nutrition standard.The paper consists of three parts:Part1: The effects of dietary energy levels on minks production performance, nutrient digestionand metabolism, and serum biochemical index.One hundred and seventy-six minks were assignedrandomly to eight groups with22minks each. Eight groups of minks were fed with energy levels of13.0MJ/Kg,13.5MJ/Kg,14.0MJ/Kg,14.5MJ/Kg,15.0MJ/Kg,15.5MJ/Kg,16.0MJ/Kg, and16.5MJ/Kg. The results showed that were as follows: There was significant difference in final body weights,nutrient digestibility, N-balance, serum parameters in difference groups(P＜0.05). There was obvioussignificant different in pelt length of male minks (P＜0.01).Part2: The effects of dietary energy sources on growth performance, nutrient digestion andmetabolism of minks in late growing period. One hundred and twenty minks were assigned randomly tofour groups with40minks each. Four groups of minks were fed with energy sources of soy bean oil,chicken fat, fish oil,lard and15.5MJ/Kg. The results were demonstrated that there was no significantdifference in final weight(P＞0.05) of minks. CP digestibility and N retained of male minks in lardgroups was better than soy bean oil group. the digestibility of crude protein of female minks in chickenfat group was better than Soy bean oil group. EE digestibility of lard group was the highest one. NPV,BV in the dietary addition of lard were best. There was significant difference in DM, EM with eachgroup (P＜0.05).Part3: Effects of dietary energy sources on growth performance, nutrient digestion and metabolismof minks in furring period. One hundred minks were assigned randomly to four groups with25minkseach. Four groups of minks were fed with energy sources of soy bean oil, chicken fat, fish oil, and lard,the metabolic energy was16.5MJ/Kg (fat level is27%). The results were illustrated that there was nosignificant difference in final body weight, EE digestibility, N-balance,between groups fed power drydiet (P＞0.05) of male minks, GE、UE、ME、DE in chicken fat group was higher than fish oil group,there was no significant different in final body weight, N-balance of female minks. EE digestibility infish oil was best. However, Fur quality of minks in Soy bean oil group was better than fish oil group.In conclusion, based on this study,1) In late growing period, the metabolic energy of male minkswas15.0MJ/Kg and the female was16.75MJ/Kg, they had high digestibility of nutrients. In furringperiod, the male mink metabolic energy was16.19MJ/Kg and protein metabolism was27.73%that the male mink can got the longest fur; the male mink metabolic energy was15.0MJ/Kg and proteinmetabolism was30.07%that the male mink can got good fur quality; the female mink metabolic energywas14.41MJ/Kg and protein metabolism was31.27%that the male mink can got good fur quality andhad good digestibility of nutrients.2) For CP digestibility, the animal fat groups was better than theplant fat group. In late growing period, the male minks of fish oil group had good digestibility ofnutrients and got better weight. The female minks of lard groups had good production performance.3)In furring period, the different dietary energy source had no obvious effect on male minks. Compared toother groups, the fur quality of female minks in soy bean oil group was the best.