Comparative Study on Growth Performance,Slaughter Performance and Internal Organs of Fast-Growing Meat Ducks with Different Residual Feed Intake
The aim of this experiment was to compare the differences in growth performance,slaughter per-formance and internal organs of meat ducks with different residual feed intake(RFI)and to explore the effects of RFI on fast-growing meat ducks.The experiment involved 400 fast-growing meat ducks(half male and half female)as the candidate population,which were fed individually in cages from 15 to 35 days of age.After cal-culating the RFI,these birds were divided into low RFI(LRFI)and high RFI(HRFI)groups with 30 males and 30 females in each group.Each individual's weight was measured at 35 days of age,followed by the de-termination of slaughter performance.Indices such as dressed percentage,percentage of half-eviscerated yield,percentage of eviscerated yield,percentage of breast muscle yield,percentage of leg muscle yield,percentage of lean meat yield and percentage of abdominal fat yield were calculated.The weight of the liver and gizzard was also measured to calculate the percentage of liver yield and percentage of gizzard yield,and the length of duodenum,jejunum and ileum was measured and the total intestine length was calculated.The results showed as follows:1)for growth performance,the average daily feed intake and feed conversion ratio of both male and female ducks in LRFI group were extremely significantly lower than those in HRFI group(P＜0.01);there were no significant differences in the body weight at 15 and 35 days of age,metabolic body weight and average daily gain of female ducks between HRFI and LRFI groups(P＞0.05),while these indicators of male ducks in LRFI group were significantly or extremely significantly higher than those in HRFI group(P＜0.05 or P＜0.01).2)For slaughter performance,the dressed percentage and percentage of abdominal fat yield of male ducks in LRFI group were extremely significantly lower than those in HRFI group(P＜0.01),and the percent-age of breast muscle yield,percentage of leg muscle yield,percentage of lean meat yield were extremely sig-nificantly higher than those in HRFI group(P＜0.01);the percentage of abdominal fat yield of female ducks in LRFI group was extremely significantly lower than that in HRFI group(P＜0.01),and the percentage of leg muscle yield and percentage of lean meat yield were extremely significantly higher than those in HRFI group(P＜0.01),while there were no significant differences in the dressed percentage,percentage of half-eviscera-ted yield,percentage of eviscerated yield and percentage of breast muscle yield between HRFI and LRFI groups(P＞0.05).3)For internal organs,the percentage of liver yield and percentage of gizzard yield of both male and female ducks in LRFI group were significantly or extremely significantly higher than those in HRFI group(P＜0.05 or P＜0.01);there were no significant differences in the length of all intestinal segments and total in-testine length of female ducks between HRFI and LRFI groups(P＞0.05),while the length of jejunum and to-tal intestine length of male ducks in LRFI group were significantly longer than those in HRFI group(P＜0.05).In conclusion,compared to the fast-growing meat ducks with HRFI,the ducks with LRFI show a significant increase in the body weight of males,while there was no significant difference in the body weight of females.Both male and female fast-growing meat ducks with LRFI have higher feed efficiency,less abdominal fat depo-sition,and even better some indicates in slaughter performance and internal organs.This suggests that the nega-tive selection for RFI can improve the feed efficiency and slaughter performance of fast-growing meat ducks,but attention should be paid to avoid excessively rapid weight gain in male individuals.[Chinese Journal of An-imal Nutrition,2024,36(11):7040-7050]
万方数据
维普
