Effect Of Pelleting Temperature On Feed Granule Quality And Feeding Effect Of Meat Rabbits

The purpose of this experiment was to explore the effect of granulation temperature on the quality of granulated feed of meat rabbits and the effects of granulated materials produced at different granulation temperatures on the growth performance,slaughter index,meat quality,apparent digestibility of some nutrients,digestive enzyme activity and economic benefit of meat rabbits.The experiment was divided into four parts: the first part was granulation test.Using a ZHZL400 ring-mold granulator with a diameter of 4.00 mm and a compression ratio of 1:12.Six kinds of granulation temperature were set as 60 ?,65 ?,70 ?,75 ?,80 ?,85 ?,which measures the quality index of granulated material produced by six kinds of granulation temperature;the second part was feeding test,A single-factor randomized design was used to select 120 healthy Ira rabbits aged about 50 days.According to the principle of similar body weight and half male and half female,the rabbits were divided into six experimental groups.Each group had five replicates and four rabbits in each replicate group were fed with 6 kinds of granulation temperature,with a pretest period of one week and a positive test period of 49 days;the third part was digestion test.After the feeding test,one meat rabbit in each repetitive group,five in each group,totally 30 rabbits in each group were digested by whole fecal collection method for one week;the fourth part was slaughtering.At the same time of digestion test,30 meat rabbits from each repetitive group were slaughtered.After weighing each part of body weight,the foreleg muscle,hind leg muscle,abdominal muscle,back muscle,jejunum,ileum and duodenum chyme were retained to determine the relevant indicators.The results are as follows:1.The effect of granulation temperature on the hardness of meat rabbit pellet was significant(P<0.01),and the granulation temperature of 85? and 80? was significantly higher than that of 60?,65?and 70?(P<0.01).It was significantly higher in 75? group than that in 60?group and 65?group(P<0.01).The granulation temperature of 80?group was significantly lower than that of 60?group and 65?group(P<0.01),and 70?group was significantly lower than 60?group(P<0.01).The effect of granulation temperature on starch gelatinization degree of meat rabbits was significant(P < 0.01),and the granulationtemperature of 85?group was significantly higher than that of 60?group,65?group and70?group(P<0.01),and 80?group was significantly higher than 60?group,65?group,70?group and 75?group(P<0.01).The effect of granulation temperature on the powder content of meat rabbit pellet was not significant(P > 0.05).The effect of granulation temperature on the electricity consumption of meat rabbit pellet processing was not significant(P>0.05).When the granulation temperature was 80?,the hardness of the granulated material was the largest,the pulverization rate was the lowest,and the starch gelatinization degree was the highest.2.The effect of different granulation temperature on average daily gain(ADG)of meat rabbits was significant(P<0.05).The granulation temperature of 80?,75? and 70?groups was significantly higher than that of 60? group(P<0.05).The effect of different granulation temperature on feed weight ratio(F/G)of meat rabbits was significant(P<0.05).The granulation temperature of 80?,75? and 70? groups was significantly lower than that of 60? group and 85? group(P<0.05).There was no significant effect on the average daily gain(ADG)?average daily feed intake(ADFI)and the mortality rate of the rabbits fed granulated materials at different granulation temperatures(P > 0.05).When feeding granulation temperature 80? to produce granulated material,ADG was the highest,F/G was the smallest.3.The apparent digestibility of(Ash)in crude ash in meat rabbits was significantly affected by different granulation temperatures(P<0.05).The apparent digestibility of crude ash in 85? group was significantly higher than that in 65? group and 70? group(P<0.05).80? group was significantly higher than 60? group,65? group,70? group and 75?group(P < 0.05).The apparent digestibility of dry matter(DM)in meat rabbits was significantly affected by different granulation temperature(P < 0.05).The granulation temperature of 85? group and 80? group was significantly higher than that of 60? group,65? group,70? group and 75? group(P<0.05).70? group was significantly higher than60? group and 65? group(P<0.05).The apparent digestibility of neutral detergent fiber(NDF)in meat rabbit grain was significantly affected by different granulation temperature(P<0.05).The granulation temperature of 85? group and 80? group was significantly higher than that of 60? group,65? group,70? group and 75? group(P<0.05).70? group and75? group were significantly higher than 60? group and 65? group(P < 0.05).The apparent digestibility of acidic detergent fiber(ADF)was significantly affected by different granulation temperatures(P<0.05).The granulation temperature of 85? group and 80?group was significantly higher than that of 60? group,65? group and 75? group(P<0.05).The apparent digestibility of crude protein(CP)in meat rabbits was significantly affected by different granulation temperature(P<0.05).The granulation temperature of 85?group and 80? group was significantly higher than that of 60? group,65? group,70?group and 75? group(P<0.05).70? group and 75? group were significantly higher than60? group(P<0.05).The apparent digestibility of crude fiber(CF),calcium(Ca),P(P)was not significantly affected by different granulation temperature(P > 0.05).When the granulation temperature was 80?,the apparent digestibility of crude ash,dry matter and crude fiber was the highest.4.The effect of granulation temperature on abdominal slaughtering rate was significant(P<0.05).The granulation temperature of 85 ? group and 80 ? group was significantly higher than that of 60 ? group,65 ? group,70 ? group and 75 ? group(P<0.05).There was no significant difference in slaughtering rate,semi-evisceration rate,total evisceration rate,foreleg slaughtering rate,hind leg slaughtering rate and dorsal muscle slaughtering rate between different granulated materials at different granulation temperatures(P>0.05).There was no significant difference in water loss,cooking loss,shear force,p H at slaughtering time and 24 h after slaughter on rabbit meat treated with granulated materials at different granulation temperatures(P>0.05).5.The effect of different granulation temperature on intestinal enzyme activity was not significant(P>0.05).In conclusion,under the condition of this experiment,raising the granulation temperature properly was beneficial to improve the quality of meat rabbit granulated material,and feeding the granulated material produced at appropriate granulating temperature can improve theapparent digestibility of some nutrients in meat rabbit.Therefore,the suitable granulation temperature of rabbit pellet was 80 ?.