Effects of Dietary Cobalt Supplemental Level on Digestion and Metabolism of Weaned to 3-Month-Old Rex Rabbits

GAO Qin, LIU Lei, LIU Gongyan, SUN Haitao, LI Fuchang

doi:10.3969/j.issn.1006-267x.2017.03.043

Chinese Journal of Animal Nutrition >

2017 , Vol. 29 >Issue 3: 1082 - 1090

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.03.043

Molecular Nutrition

Effects of Dietary Cobalt Supplemental Level on Digestion and Metabolism of Weaned to 3-Month-Old Rex Rabbits

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1. College of Animal Science and Technology, Shandong Agricultural University, Tai'an 271018, China;
2. Animal Husbandry and Veterinary Institute, Shandong Academy of Agricultural Sciences, Jinan 250100, China

Received date: 2016-09-06

Online published: 2017-03-09

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Abstract

This experiment was conducted to study the effects of dietary cobalt supplemental level on dietary nutrient apparent digestibility, nitrogen metabolism, digestive enzyme activities in pancreas, serum biochemical indices and cobalt metabolism of weaned to 3-month-old Rex rabbits. Two hundred weaned Rex rabbits with the similar body weight were randomly assigned into 5 groups with 40 replicates in each group and each replicate contained 1 rabbit. Rabbits in 5 groups were fed experimental diets which supplemented with 0, 0.1, 0.4, 1.6 and 6.4 mg/kg cobalt ((in the form of cobalt sulfate)) on the basis of a basal diet, respectively. The trial lasted for 7 days for adaptation and 53 days for feeding test. The results showed that dietary cobalt supplemental level had no significant influence on dietary nutrient apparent digestibility (P>0.05), but with the increase of dietary cobalt supplemental level, the apparent digestibility of dietary dry matter (DM), crude protein (CP) and cobalt tended to be increased firstly and then decreased, and the highest DM and CP apparent digestibility appeared in 1.6 mg/kg cobalt supplementation group and the highest cobalt apparent digestibility appeared in 0.4 mg/kg cobalt supplementation group. Dietary cobalt supplemental level had no significant influences on fecal nitrogen (FN), digestible nitrogen (DN), nitrogen apparent digestibility (NAD) and nitrogen biological value (NBV) (P>0.05), but had significant influences on nitrogen intake (NI), urinary nitrogen (UN), retention nitrogen (RN) and nitrogen utilization rate (NUR) (P<0.05). With the increase of dietary cobalt supplemental level, NI, RN and NUR tended to be decreased firstly and then increased, UN gradually tended to be decreased, and the highest NI, RN and NUR all appeared in 1.6 mg/kg cobalt supplementation group. Dietary cobalt supplemental level had significant influence on trypsin activity in pancreas (P<0.05), and the highest value appeared in 0.4 mg/kg cobalt supplementation group. Dietary cobalt supplemental level had significant influence on serum urea (UR) content (P<0.05), with the increase of dietary cobalt supplemental level, the serum UR content tended to be decreased firstly and then increased, and the lowest value appeared in 1.6 mg/kg cobalt supplementation group. Dietary cobalt supplemental level had no significant influences on serum total protein (TP) and albumin (ALB) contents (P>0.05). Dietary cobalt supplemental level had significant influences on the content of cobalt in fecal, urine, muscle, spleen and kidney (P<0.05), with the increase of dietary cobalt supplemental level, the content of cobalt in fecal, urine, muscle, spleen and kidney continued to be increased. Considering all indices of this experiment, appropriate dietary cobalt supplemental level is 0.4 to 1.6 mg/kg (the actual measured content of cobalt in the diet is 0.60 to 1.83 mg/kg) for weaned to 3-month-old Rex rabbits.

Key words： cobalt; Rex rabbits; nutrient apparent digestibility; nitrogen metabolism; cobalt metabolism

Cite this article

GAO Qin, LIU Lei, LIU Gongyan, SUN Haitao, LI Fuchang . Effects of Dietary Cobalt Supplemental Level on Digestion and Metabolism of Weaned to 3-Month-Old Rex Rabbits[J]. Chinese Journal of Animal Nutrition, 2017 , 29(3) : 1082 -1090 . DOI: 10.3969/j.issn.1006-267x.2017.03.043

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