Trace Element Requirements of Weaned Lambs of Shaanbei White Cashmere Goats

ZHOU Guangchen, WANG Hao, LIN Changlong, CHEN Yulin, YANG Yuxin

doi:10.3969/j.issn.1006-267x.2018.05.018

Chinese Journal of Animal Nutrition >

2018 , Vol. 30 >Issue 5: 1760 - 1770

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.05.018

Molecular Nutrition

Trace Element Requirements of Weaned Lambs of Shaanbei White Cashmere Goats

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College of Animal Science and Technology, Northwest Agriculture and Forestry University, Yangling 712100, China

Received date: 2017-10-23

Online published: 2018-05-06

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Abstract

This study was conducted to evaluate effects of different levels of dietary trace elements on performance, nutrients digestion and metabolism, trace element deposition in tissues of weaned lambs of Shaanbei white cashmere goats. Twenty-four 6-month old weaned lambs of Shaanbei cashmere goats with about 20 kg of body weight were selected and randomly assigned to four groups, each group had three replicates, and each replicate had 2 lambs. The goats in different groups were fed diets containing different trace elements levels. In group Ⅰ, iron, copper, zinc, manganese and cobalt contents in diet were 279.30, 15.35, 63.41, 68.51 and 0.22 mg/kg, respectively, in group Ⅱ, those were 290.14, 18.19, 81.62 and 94.10 mg/kg, respectively, in group Ⅲ, those were 302.23, 28.20, 103.28, 133.85 and 0.43 mg/kg, respectively, in group Ⅳ, those were 319.74, 31.60, 126.64, 167.07 and 0.67 mg/kg, respectively. The feeding trial lasted for 65 d including 5 d of pre-test period and 60 d of test period. On day 30 of test period in feeding trial, one lamb from each repeat was selected and fed individually in cage to carry out digestion and metabolism test. The pre-test period was 7 d, and the test was 7 d. At the last day of feeding trial, the rest 12 lambs were slaughtered to collected heart, liver, spleen, kidney and the longissimus dorsi, and trace element deposition were determined. The results showed as follows:1) average daily gain and feed to gain ratio in group Ⅱ were significantly higher or lower than those in group Ⅰ (P<0.05), and had no significant difference with those in groups Ⅲ and Ⅳ (P>0.05);dry matter intake in group Ⅱ was significantly higher than that in the other groups (P<0.05). 2) Fecal energy and urine energy in groups Ⅰ and Ⅱ were significantly lower than those in groups Ⅲ and Ⅳ(P<0.05), and gross energy digestibility was significantly higher than that in groups Ⅲ and Ⅳ (P<0.05). 3) Nitrogen retention rate, nitrogen intake, digestible nitrogen and retention nitrogen in group Ⅲ were the highest, and were significantly higher than those in groups Ⅰ and Ⅳ(P<0.05), but had no significant differences compared with group Ⅱ (P>0.05). 4) With the increase of supplemental levels of trace elements, apparent metabolic rate of trace elements were firstly increased and then decreased, and apparent metabolic rates of iron, copper, zinc, manganese and cobalt in group Ⅱ were the highest. 5) Group Ⅱ had the highest manganese deposition rate in longissimus dorsi and heart, and the highest iron, iodine, copper and manganese deposition in liver; in spleen, iron deposition in group Ⅱ was the highest, iodine deposition in group Ⅳ was the highest; in kidney, zinc deposition in group Ⅱ was the highest, and iodine deposition in group Ⅰ was the highest. Under the conditions in the present study, the optimal combination of trace element requirements for Shaanbei white cashmere goats were as follows:iron 290.14 mg/kg, copper 18.19 mg/kg, zinc 81.62 mg/k, manganese 94.10 mg/kg and cobalt 0.31 mg/kg.

Key words： Shaanbei white cashmere goats; trace elements; performance; tissue deposition

Cite this article

ZHOU Guangchen, WANG Hao, LIN Changlong, CHEN Yulin, YANG Yuxin . Trace Element Requirements of Weaned Lambs of Shaanbei White Cashmere Goats[J]. Chinese Journal of Animal Nutrition, 2018 , 30(5) : 1760 -1770 . DOI: 10.3969/j.issn.1006-267x.2018.05.018

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