不同开食料采食量断液体饲粮对羔羊生长发育的影响

doi:10.3864/j.issn.0578-1752.2018.02.013

Abstract

Abstract: 【Objective】 This study was conducted to investigate the effects of weaning liquid diet (milk replacer) at different level of creep feed intake on growth performance, slaughter performance and development of visceral organ and gastrointestinal tract of lambs to confirm the best time to wean milk replacer and providing theoretical basis of growth and development of lambs. 【Method】 Lambs were divided into 4 treatments by using single factor experimental design that experimental factor was creep feed intake on the time of weaning milk replacer. Each treatment had 16 lambs and each lamb was as a replication. Sixty-four purebred Hu lambs with similar body weight were selected, weaned breast-milk and fed milk replacer at 10 days of age. Lambs were provided creep feed at 15 days of age and could take the feed freely. When consuming level of dry matter of creep feed reached 200, 300, 400 and 500g, lambs were weaned milk replacer respectively and assigned to A, B, C and D groups correspondingly. During the animal feeding trial, growth performance including body weight, average daily gain, feed intake and feed conversion efficiency was determined. Slaughter experiment was conducted at 90 ages of age to determine slaughter performance including development of visceral organ and gastrointestinal tract of lambs. 【Result】 The results showed as follows: (1) average daily gain in B and C groups was significantly higher than that in D group (P＜0.05) from 10 to 90 days; intake of milk replacer in A and B groups was significantly lower than that in C and D groups (P＜0.05), and A group had lower milk replacer intake than B group (P＜0.05); the creep feed intake in A and B group was higher than that in C and D group (P＜0.05) during the whole trial; the feed conversion efficiency in B and C groups was lower that in D group (P＜0.05) from 10 to 90 d and from weaning milk replacer time to 90 d. (2) rumen weight in A, B and C group was significant higher than that in D group (P＜0.05), and C group was higher than A group (P＜0.05); despite the ratio of rumen to total stomachus compositus weight and live weight before slaughter showed no significance (P＞0.05), the mean values in B and C groups of these 2 parameters were higher than that in A and D group; the weight of reticulum, omasum in C group was higher than that in A and D groups (P＜0.05); the weight of whole stomach in C group was higher than that in A and D groups (P＜0.05), and the ratio of whole stomach weight to live weight before slaughter were not significantly different among 4 groups (P＞0.05), but the mean values of it in B and C groups were higher than those in A and D group; although small intestine weight and the ratio of its weight to live weight before slaughter were not significantly different (P＞0.05) among different groups, the mean values in B and C groups were higher than those in A and D groups; A and B groups had higher large intestine weight than D group (P＜0.05), and no difference was observed in the ratio of large intestine weight to live weight before slaughter among 4 groups (P＞0.05), but the mean values of it were greater in B and C groups than those in A and D groups. (3) B and C group had significant higher heart weight than D group (P＜0.05) while weight of other visceral organs and ratio of their weight to live weight before slaughter were not significantly different (P＞0.05); (4) at 90 days of age, the slaughter body weight, empty body weight, carcass weight and 24h carcass weight in A, B and C groups were higher than those in D group (P＜0.05), and empty body weight in C group was higher than that in A and B groups (P＜0.05). carcass weight and 24h carcass weight in C group were higher than that in A group (P＜0.05); eye muscle area in B and C groups was significantly higher than that in A and D groups (P＜0.05).【Conclusion】 In conclusion, lambs showed better growth and slaughter performance as well as gastrointestinal development when they could consume an equivalent of 300 or 400g dry matter of creep feed for 3 consecutive days and were weaned milk replacer. Therefore, optimal effect could be reached for the Hu lambs to be weaned milk replacer at creep feed intake level of 300g dry matter.

Key words: lambs, Hu sheep, milk replacer, growth and development, weaning, rumen

CHAI JianMin, WANG Bo, QI MinLi, WANG ShiQin, TU Yan, TAO XiaoJing, DIAO QiYu, ZHANG NaiFeng. Effect of Weaning Liquid Diet at Different Level of Creep Feed Intake on Growth and Development of Lambs[J].Scientia Agricultura Sinica, 2018, 51(2): 341-350.

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Effect of Weaning Liquid Diet at Different Level of Creep Feed Intake on Growth and Development of Lambs

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