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肉种鸡补饲VD3对肉仔鸡生产性能和胫骨软骨发育的影响

摘要:在产蛋周期的4个不同阶段,对母体补饲VD3,肉仔鸡饲喂导致胫骨软骨发育不良日粮或营养充分日粮对肉仔鸡生产性能和骨质量的影响。实验选用Ross×Ross肉种鸡作为实验动物,饲喂玉米豆粕型日粮,日粮中添加不同水平的VD3,试验从肉种鸡24周龄开始到66周龄时结束。收集肉种鸡39445364周龄时的鸡蛋并孵化。肉种鸡分别饲喂250IU VD3/kg2000IU VD3/kg水平,肉仔鸡从0日龄一直饲喂到16日龄。肉仔鸡16日龄时,对其进行称重并屠宰,取左胫骨进行骨灰分测定,右胫骨用来评价软骨发育不良的严重程度(严重程度:0123,其中3最为严重)和发病率。肉种鸡饲喂低VD3水平组,采集44周龄和64周龄的鸡蛋孵化的肉仔鸡,在0日龄时体重没有显著差异,但到16日龄的体增重和饲料采食量显著的低。不同VD3水平,39周龄和44周龄的鸡蛋孵化出的肉仔鸡,软骨发育不良较严重(低VD3水平:1.39  1.47 ;高VD3水平:0.441.01),发病率较高(VD3水平:35 50%;高VD3水平:34 45%)53周龄和64周龄的鸡蛋孵化出的肉仔鸡,高VD3水平比低VD3水平降低了软骨发育不良的严重程度(VD3水平:1.39  1.47 ;高VD3水平:0.441.01)和发病率(VD3水平:36 40% ;高VD3水平:817 %)。本试验中,在接近产蛋周期末时产蛋量下降,母鸡饲喂高水平VD3可能会在蛋里沉积充足的VD3,来维持016日龄的体增重并减少软骨发育不良的严重度和发病率。母鸡饲喂低VD3水平日粮结果不理想。  

关键词:母源VD3,胫骨软骨发育不良,鸡  

   

   

The Effect of Maternal Dietary Vitamin DSupplementation on Performance and Tibial Dyschondroplasia of Broiler Chicks  

J. P. Driver, 1 A . Atencio, G. M. Pesti, H. M. Edwards, Jr., and R. I Bakalli  

Department of Poultry Science, The  University  of  Georgia ,   Athens ,  Georgia   30602-2772  

ABSTRACT A series of experiments was conducted to investigate the effects of maternal dietary vitamin D3 supplementation at 4 different times during the laying cycle, on the performance and bone quality of broiler chicks fed a diet that induced tibial dyschondroplasia (TD) or an adequate diet. Ross × Ross broiler breeder hens were fed a corn-soy diet with various levels of vitamin D3 from 24 to 66 wk of age. Eggs were collected at 39, 44, 53, and 64 wk of age and hatched. Chicks from hens fed 250 IU of D3/kg (low maternal D3 or LMD3) and 2,000 IU of D3/ kg (high maternal D3 or HMD3) levels were placed in battery brooders and fed the diets from 0 to 16 d. At 16 d, the chicks were weighed and killed; the left tibias were used for bone ash determinations, and the right tibias were used to score the incidence and severity of TD (0, 1, 2, or 3, where 3 is the most severe). Body weight gain and feed intake were significantly lower for the LMD3 chicks at wk 44 and 64, although there was no difference  

Key words: maternal vitamin D3, tibial dyschondroplasia, chick 


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