This experiment was conducted to investigate the effects of dietary iodine supplemental level on growth performance, slaughter performance, meat quality and fur quality of 3 to 5-month-old growing Rex rabbits. Two hundred 3-month-old healthy Rex rabbits with similar body weight were randomly divided into 5 groups with 40 replicates in each group and 1 rabbit in each replicate. Rabbits in 5 groups were fed basal diets supplemented with 0, 0.2, 0.4, 0.8 and 1.6 mg/kg iodine (in the form of potash iodide), respectively. The adaptation period lasted for 7 days and the formal period lasted for 53 days. The results showed as follows:1) under the condition of there was no significant difference on initial body weight (IBW), dietary iodine supplemental level had significant influence on final body weight (FBW) of Rex rabbits (P<0.05), and had extremely significant influence on average daily feed intake (ADFI) of Rex rabbits (P<0.01), and had no significant influence on average daily gain (ADG) and feed/gain (F/G) of Rex rabbits (P>0.05); the highest ADG and ADFI was in 0.8 mg/kg group, and the lowest F/G was in 0.8 mg/kg group. 2) Dietary iodine supplemental level had significant influences on hind leg muscle ratio and redness value of Rex rabbits (P<0.05), and had extremely significant influence on fore leg muscle ratio (P<0.01), but had no significant influence on eviscerated ratio, back lumbar muscle ratio and meat quality indices including pH, drip loss ratio and meat color (lightness and yellowness values) (P>0.05). 3) Dietary iodine supplemental level had extremely significant influence on fur area, fur whiteness and tear strength of Rex rabbits (P<0.01), and the highest values were at 0.8, 0.4 and 0.4 mg/kg group, respectively. Dietary iodine supplemental level had significant influence on fur weight and fur thickness of Rex rabbits (P<0.05), but had no significant influence on hair follicle density, fur glossiness, fur length, tearing break point thickness, tensile strength and stretched ratio (P>0.05). Considering all indexes of this experiment, the appropriate iodine supplemental level is 0.8 mg/kg for 3 to 5-month-old Rex rabbits (the measured value of diet iodine content is 0.92 mg/kg).
SHEN Lei, LIU Gongyan, ZUO Wenshan, ZHAO Xiaoyu, LIU Lei, LI Fuchang
. Effects of Dietary Iodine Supplemental Level on Growth Performance, Slaughter Performance, Meat Quality and Fur Quality of Growing Rex Rabbits[J]. Chinese Journal of Animal Nutrition, 2018
, 30(1)
: 156
-162
.
DOI: 10.3969/j.issn.1006-267x.2018.01.020
[1] 杨正.现代养兔[M].北京:中国农业出版社,1999.
[2] 孙全文.必需微量元素碘对家兔的营养作用[J].中国养兔,2009(5):34-39.
[3] 朱卫华,余红梅.猪碘缺乏症的诊断报告[J].上海畜牧兽医通讯,2000(1):31.
[4] 奚刚,许梓荣,钱利纯.日粮中碘水平对妊娠母猪繁殖性能的影响[J].浙江大学学报(农业与生命科学版),2000,26(2):165-168.
[5] NRC.Nutrient requirements of rabbits[M].2nd ed.Washington,D.C.:National Academy Press,1977.
[6] DE BLAS C,MATEOS G.Nutrition of the rabbit[M].New York:CABI Publishing,1998:297-308.
[7] 孔祥瑞.必需微量元素的营养、生理及临床意义[M].合肥:安徽科学技术出版社,1992,121.
[8] 许斌.奶牛碘缺乏症及其防治试验[J].畜牧与兽医,2000,32(1):13-15.
[9] BEDI S P S,PATTANAIK A K,KHAN S A,et al.Effect of graded levels of iodine supplementation on the performance of barbari goats[J].Indian Journal of Animal Sciences,2000,70:736-739.
[10] 李星晨,王宝维,王福香,等.碘对1-4周龄五龙鹅生长性能、屠宰性能和血清抗氧化指标的影响[J].动物营养学报,2016,28(4):1084-1089.
[11] 刘汉中,麻名文,李鑫,等.日粮碘添加水平对断奶至2月龄生长肉兔生长性能和血清生化指标的影响[J].动物营养学报,2010,22(4):1076-1080.
[12] MEYER U,WEIGEL K,SCHÖNE F,et al.Effect of dietary iodine on growth and iodine status of growing fattening bulls[J].Livestock Science,2008,115(2/3):219-225.
[13] 王建桥,范益飞,马建胜.慈溪市獭兔生产现状及发展思路调查[J].浙江畜牧兽,2003,28(4):15-16.
[14] 赵明夫.肉质评价的指标[J].农牧产品工程,2012(5):279.
[15] 张福勋.獭兔毛皮张质量与取皮时间的相关性研究[J].当代畜牧,2005(6):4-6.
[16] 吴金山.如何评定獭兔皮质量[J].中国养兔,2005(1):44-45.
[17] 中国轻工业联合会综合业务部.中国轻工业标准汇编(毛皮与制革卷)[M].2版.北京:中国标准出版社,2006:90-97.
