RESEARCH PAPER

Effects of Selenohomolanthionine on Growth Performance, Blood Indices, Ruminal Fermentation, Nutrient Apparent Digestibility and Nitrogen Metabolism of Shaanbei White Gashmere Wether Goats

  • LI Tuo ,
  • QU Lei ,
  • ZHU Haijing ,
  • LI Longping
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  • 1. Shaanxi Province Engineering & Technology Research Center of Cashmere Goat, Yulin University, Yulin 719000, China;
    2. College of Life Sciences, Yulin University, Yulin 719000, China

Received date: 2022-05-20

  Online published: 2022-12-15

Abstract

This experiment was conducted to study the effects of dietary supplementation of selenohomolanthionine (Se-HLan) on the growth performance, blood routine, rumen fermentation, nutrient apparent digestibility and nitrogen metabolism of Shaanbei white cashmere wether goats. Thirty-two 6-month-old Shaanbei white cashmere wether goats with the similar body weight[approximately (26.18±2.71) kg] and good health were randomly assigned to 4 groups with 8 goats in each. The pre-trial period lasted for 10 days and the experimental period lasted for 60 days. The content of selenium in the basal diet was 0.016 mg/kg, and 0, 71, 146 and 296 mg/kg Se-HLan were added to the basal diet, to make the contents of selenium in diets were 0.016 (group Ⅰ), 0.300 (group Ⅱ), 0.600 (group Ⅲ) and 1.200 mg/kg (group Ⅳ), respectively. After the feeding test, all the experimental goats underwent an 11-day digestion and metabolism test, of which the preliminary test period was 7 days and the formal period was 4 days. The results showed as follows:1) with the increase of Se-HLan addition, the average daily feed intake (ADFI) of the experimental goats showed firstly increased and then decreased in a quadratic manner (P<0.05). Average daily gain (ADG) of the experimental goats in the group Ⅲ was significantly higher than that in group Ⅰ (P<0.05), and feed/gain (F/G) in group Ⅲ was significantly lower than that in the group Ⅰ (P<0.05). 2) Compared with group Ⅰ, group Ⅲ had significantly higher eosinophil count and white blood cell count (P<0.05). Dietary supplemented with different levels of Se-HLan had no significant effects on other blood routine indexes (P>0.05). With dietary Se-HLan level increased, the serum albumin (ALB), total protein (TP) contents and superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) activities in the experimental goats showed firstly increased and then decreased in a quadratic manner (P<0.01), while malondialdehyde (MDA) content showed firstly decreased and then increased in a quadratic manner (P<0.01). The highest values of serum TP, ALB contents and SOD, GSH-Px activities were found in group Ⅲ, which were significantly higher than those in the group Ⅰ (P<0.05), while MDA content was the lowest, and which was significantly lower than the other three groups (P<0.05). The serum urea nitrogen (UN) content gradually decreased with the increase of Se-HLan supplementation, among which the group Ⅰ had the highest UN content, which was significantly higher than that in the groups Ⅱ and Ⅳ (P<0.05). 3) Adding Se-HLan had a tendency to increase rumen pH, but there was no significant difference among all groups (P>0.05). The concentration of ammonia nitrogen (NH3-N) in rumen fluid in group Ⅲ was significantly higher than that in the other three groups (P<0.01). The acetic acid concentration and acetic acid/propionic acid value in group Ⅲ were the lowest, which were significantly lower than those in groups Ⅰ and Ⅱ (P<0.05). The concentration of propionic acid in group Ⅲ was the highest and significantly higher than that in the other three groups (P<0.05). 4) With dietary Se-HLan level increased, gross energy intake (GEI), fecal energy (FE) and digestible energy (DE) in the experimental goats showed firstly increased and then decreased in a quadratic manner (P<0.01), group Ⅳ had the highest apparent digestibility of total energy, but there was no significant difference among four groups (P>0.05). 5) The apparent digestibility of dry matter (DM), organic matter (OM), acid detergent fiber (ADF) and neutral detergent fiber (NDF) in groups Ⅲ and Ⅳ was extremely significantly higher than that in group Ⅰ (P<0.05 or P<0.01). The apparent digestibility of ether extract (EE) in group Ⅳ was significantly higher than that in group Ⅰ (P<0.01), and the apparent digestibility of phosphorus (P) in group Ⅲ was significantly higher than that in group Ⅰ (P<0.05). 6) Supplementation of Se-HLan affected nitrogen metabolism, and nitrogen intake in group Ⅲ was significantly higher than that in group Ⅱ (P<0.01). The digestible nitrogen, deposited nitrogen and nitrogen deposition rate in group Ⅲ were significantly higher than those in groups Ⅰ and Ⅱ (P<0.05), and the nitrogen digestibility rate in group Ⅲ was significantly higher than that in group Ⅰ (P<0.05). Considering all indexes of this experiment, the appropriate selenium (the form is Se-HLan) supplemental level is 0.600 mg/kg in the diet of growing Shaanbei white cashmere wether goats in growth period.

Cite this article

LI Tuo , QU Lei , ZHU Haijing , LI Longping . Effects of Selenohomolanthionine on Growth Performance, Blood Indices, Ruminal Fermentation, Nutrient Apparent Digestibility and Nitrogen Metabolism of Shaanbei White Gashmere Wether Goats[J]. Chinese Journal of Animal Nutrition, 2022 , 34(12) : 7909 -7922 . DOI: 10.3969/j.issn.1006-267x.2022.12.040

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