| Protein ingredients used in formulating animal diet holds a pivotal part in the feed industry where soybean meal constitutes the main protein source.However,with the continual intensification to a scale in-depth in the development of livestock and poultry production,it has led to series of challenges,including the shortage of raw materials and rising costs that face the industry.Therefore,the development of high-quality protein feed that can replace soybean meal has become the industry’s focal attention.Rapeseed meal is an oil by-product with high protein content and amino acid balance.It has been widely used in chickens and ducks as protein feed material with positive results,but rarely used in geese production.Therefore,this experiment aimed to explore the effects of replacing soybean meal with rapeseed meal on growth performance,slaughter performance,and serum parameters of geese to reference rapeseed application meals in meat production geese.A total of 270 35-day-old Jiangnan white goslings with the same batch and similar weight were randomly selected and divided into five groups with six replicates in each group and nine goslings per replicate.The control group(Group Ⅰ)was fed with a basal corn-soybean meal(corn-SBM)diet.The other four experimental diets(Group Ⅱ-Ⅴ)were fed inclusion levels from 4,8,12,or 16%of rapeseed meal(RSM),respectively,of SBM’s dietary protein content in the control diet replaced with RSM.The geese were pre-fed with experimental diets one week before the start of the trial.Water and feed were provided ad libitum during the trial.The bodyweight and feed intake per replicate were recorded weekly.At 70-d,two geese per replicate were randomly selected,fasted for 12 h,and weighed individually.The geese were slaughtered using one goose per replicate to determine slaughter performance,body size,development of visceral organs,and serum parameters.The others were used to assess muscle quality parameters.The results showed that:1.Replacing soybean meal with rapeseed meal in diets did not affect geese’s body weights at 49 d and 70 d of age(P>0.05).Similar average daily feed intake,average daily weight gain,and feed conversion ration were observed among groups during 35 to 49 d,49 to 70 d,and 35 to 70 d of age(P>0.05).2.At the age of 70 d,different rapeseed meal levels had no significant effect on slaughter yield,half-eviscerated carcass yield,eviscerated carcass yield,breast yield,thigh yield,or abdominal fat yield of geese(P>0.05).3.At the age of 70 d,geese in Group II-V had a similar visceral index.Moreover,the relative length and the relative weight of the intestinal segments(duodenum,jejunum,ileum,small intestine,cecum)of geese were similar as compared to the control group(P>0.05).However,geese in Group V had a larger relative weight of Bursa Fabricius than geese in Group Ⅲ(P<0.05).4.There was no significant effect of different rapeseed meal levels on keel length,tibial length,tibial circumference,semi diving length,and neck length of geese at 70 d(P>0.05).5.At the age of 70 d,different levels of rapeseed meal had no significant effect on serum metabolites(total protein,albumin,glucose,triglyceride,total cholesterol,high-density lipoprotein,low-density lipoprotein,urea,uric acid,inorganic phosphorus,calcium,alanine aminotransferase,aspartate aminotransferase,and alkaline phosphatase)of geese in each group(P>0.05).6.Different levels of rapeseed meal had no significant effect on L*,a*,b*,and pH45min of the pectoral and leg muscles of geese at 70 d(P>0.05).Compared with the geese fed with a 4%rapeseed meal,the*of the pectoral muscle of geese fed with a 16%rapeseed meal showed an increasing trend(P=0.06).In conclusion,the substitution of 4%-16%rapeseed meal for soybean meal in the diet had no negative effect on the growth performance and slaughter performance(70 days old)of 35-70-day-old geese,indicating that it was feasible to add 16%rapeseed meal to the diet under the experimental conditions. |
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