RUMINANT AND HERBIVORE NUTRITION AND FEED

Effects of Dietary Different Digestive Energy Levels on Growth Performance, Nutrient Apparent Digestibility and Serum Biochemical Indices of 25 to 35 kg Male Shaanbei White Cashmere Goats

  • LI Longping ,
  • LI Tuo ,
  • ZHU Haijing ,
  • SHI Lei ,
  • LI Yuchao ,
  • GAO Haisong ,
  • CHEN Qian ,
  • QU Xianxian ,
  • YI Yuxuan ,
  • LI Ziyu ,
  • QU Lei
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  • 1. Shanxi 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: 2021-04-21

  Online published: 2021-11-10

Supported by

 

Abstract

This experiment was conducted to investigate the effects of dietary different digestive energy levels on growth performance, apparent digestibility of nutrients and serum biochemical indices of 25 to 35 kg male Shaanbei white cashmere goats. A total of 32 healthy 6-month-old male Shaanbei white cashmere goats with similar body weight[(26.27±1.49) kg] were selected and randomly divided into 4 groups (groups Ⅰ, Ⅱ, Ⅲ and Ⅳ) using a single-factor randomized block design. The crude protein (CP) level was 11.06%, and groups Ⅰ, Ⅱ, Ⅲ and Ⅳ were fed four diets with different digestive energy levels (9.28, 9.77, 10.27 and 10.77 MJ/kg, respectively). The feeding experiment lasted for 60 days, and then 3 goats per group were selected for a digestion and metabolism trial after the goats in each group reached 35 kg of average body weight, and the pretrial and trial lasted for 7 and 6 days, respectively. The results showed as follows:1) goats in group Ⅱ had the greatest average daily dry matter intake and average daily weight gain, while the lowest feed to gain ratio (F/G). However, there was no significant difference among groups (P>0.05). 2) The weight gain and economic benefits in group Ⅱ were the greatest among groups, followed by groups Ⅰ, Ⅲ and Ⅳ. However, no significant difference among groups were observed (P>0.05). 3) Group Ⅱ had the highest gross energy intake, digestible energy and energy apparent digestibility. The gross energy intake was extremely significantly higher than that in group Ⅲ and Ⅳ (P<0.01), and digestive energy was significantly higher than that in groups Ⅲ and Ⅳ (P<0.05), the energy apparent digestibility was significantly higher than that in group Ⅳ (P<0.05); group Ⅰ had the highest fecal energy, which was significantly higher than groups Ⅲ and Ⅳ (P<0.01), groups Ⅱ, and Ⅲ were the lowest. 4) Group Ⅱ had the highest the apparent digestibility of dry matter (DM), organic matter (OM), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF) and crude fiber (CP), with a trend of first increasing and then decreasing with the increase of digestible energy level. Among them, the apparent digestibility of DM was significantly higher than that in group Ⅰ (P<0.01) and significantly higher than that in group Ⅳ (P<0.05). The apparent digestibility of OM was significantly higher than that in group Ⅳ (P<0.05). The apparent digestibility of NDF was significantly higher than that in groups Ⅲ and Ⅳ (P<0.05), the apparent digestibility of ADF was significantly higher than that in the other three groups (P<0.01), and the apparent digestibility of CF was significantly higher than that in group Ⅳ (P<0.01) and significantly higher than that in group Ⅰ (P<0.05). The apparent digestibility of CP was significantly higher than that in group Ⅳ (P<0.01). The apparent digestibility of EE in group Ⅱ was the lowest, significantly lower than that in group Ⅳ (P<0.01), with a trend to gradually increase with the increasing of digestible energy level. 5)The different digestible energy levels of the diet had no significant effect on the serum total cholesterol, high-density lipoprotein cholesterol and total protein contents of the goats (P>0.05). The serum contents of nonesterified fatty acid (NEFA), β-hydroxybutyric acid (β-HBA) and triglycerides (TG) were gradually decreased with the increasing of dietary digestible energy level; among them, the NEFA content in group Ⅰ was significantly higher than that in group Ⅳ (P<0.05); β-HBA and TG contents in groups Ⅰ and Ⅱ were significantly higher than that in groups Ⅲ and Ⅳ (P<0.05). The contents of serum glucose (GLU), albumin (ALB) and low-density lipoprotein (LDL) showed a trend of first increasing and then decreasing with the increasing of digestible energy level. The GLU and ALB contents in group Ⅱ were significantly higher than those in group Ⅰ (P<0.05), LDL content in group Ⅱ was significantly higher than that in group Ⅲ (P<0.05) and extremely significantly higher than that in group Ⅳ (P<0.01). The group Ⅰ of goats had the highest serum urea nitrogen (UN) content, which was extremely significantly higher than that in groups Ⅱ and Ⅲ (P<0.01). Overall, based on the above results and considering the feeding cost and gain benefits, the optimal dietary digestible energy level of 25 to 35 kg male Shaanbei white cashmere goats is 9.77 MJ/kg.

Cite this article

LI Longping , LI Tuo , ZHU Haijing , SHI Lei , LI Yuchao , GAO Haisong , CHEN Qian , QU Xianxian , YI Yuxuan , LI Ziyu , QU Lei . Effects of Dietary Different Digestive Energy Levels on Growth Performance, Nutrient Apparent Digestibility and Serum Biochemical Indices of 25 to 35 kg Male Shaanbei White Cashmere Goats[J]. Chinese Journal of Animal Nutrition, 2021 , 33(11) : 6277 -6289 . DOI: 10.3969/j.issn.1006-267x.2021.11.028

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