Effects of Dietary Digestible Energy and Digestible Crude Protein Levels on Nutrient Apparent Digestibility of Yanshan Cashmere Goats

ZHANG Jiwei, LI Zhenlin, ZHAI Gang, GAO Kun, ZHANG Yingjie, LIU Yueqin, DUAN Chunhui

doi:10.3969/j.issn.1006-267x.2018.10.020

2018 , Vol. 30 >Issue 10: 3958 - 3967

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.10.020

Molecular Nutrition

Effects of Dietary Digestible Energy and Digestible Crude Protein Levels on Nutrient Apparent Digestibility of Yanshan Cashmere Goats

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1. College of Animal Science and Technology, Agricultural University of Hebei, Baoding 071000, China;
2. Hebei Qinglong Animal Husbandry Bureau, Qinglong 066500, China

Received date: 2018-03-20

Online published: 2018-10-20

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Abstract

The objective of this study was to evaluate the effects of dietary digestible energy (DE) and digestible crude protein (DCP) levels on nutrient apparent digestibility of Yanshan cashmere goats under stall-feeding condition. Ninety 4-month-old weaned male Yanshan cashmere goats with good body condition and body weight of (16.17±1.90) kg were divided into 9 groups with 10 goats per group. Nine diets were formulated according to a 3×3 completely random experiment design, in which DE were designed at 3 levels and they were low (11.6 MJ/kg), medium (12.8 MJ/kg) and high (14 MJ/kg), DCP were also designed at 3 levels and they were low (8.5%), medium (9.5%) and high (10.5%). Goats in each group randomly fed one of nine diets. Four lambs per group were selected for a digestion and metabolism trial after the lambs in each group reached 20 kg of average body weight, and the pretrial and trial lasted for 7 and 3 days, respectively. The results showed as follows:1) the fecal energy (FE) was significantly decreased with the increase of dietary DE level (P<0.05), but the gross energy (GE) was significantly increased (P<0.05). Dietary DCP level and the interaction of DE level and DCP level had no significant effects on GE, FE, urinary energy (UE), DE and GE apparent digestibility. 2) The nitrogen (N) intake and fecal N were significantly decreased with the increase of dietary DCP level (P<0.05). N apparent digestibility in low and medium DE level groups was significantly higher than that in high DE level group (P<0.05). The N intake and N apparent digestibility in low DCP level group was significantly lower than those in high DE level group (P<0.05). The digestible N in low and medium DCP level groups was significantly lower than that in high DE level group (P<0.05). The interaction of DE level and DCP level had no significant effects on N metabolism indices (P>0.05). 3)The apparent digestibility of dry matter (DM), organic matter (OM), calcium(Ca) and ether extract (EE) were gradually increased with the increase of dietary DCP level (P<0.05). The apparent digestibility of DM and OM showed significant difference among groups (P<0.05), the apparent digestibility of EE in high DE level group was significantly higher than that in low DE level group (P<0.05), and the apparent digestibility of Ca in high and medium DE level groups was significantly higher than that in low DE level group (P<0.05). Dietary DCP level and the interaction of DE level and DCP level had no significant effects on the apparent digestibility of DM, OM, EE, neutral detergent fiber (NDF), acid detergent fiber (ADF), Ca and phosphorus (P). In conclusion, the apparent digestibility of DM, OM, EE, Ca, GE and N are increased continuously with the increase of dietary DE level, and dietary DCP level significantly affects the N intake, digestible N and N apparent digestibility of Yanshan cashmere goats. DE and the apparent digestibility of GE and N of Yanshan cashmere goats are highest in the diet with 14 MJ/kg DE and 10.5% DCP, and the N retention is highest of Yanshan cashmere goats in the diet with 12.8 MJ/kg DE and 10.5% DCP.

Key words： Yanshan cashmere goats; digestible energy; digestible crude protein; nutrient; apparent digestibility

Cite this article

ZHANG Jiwei, LI Zhenlin, ZHAI Gang, GAO Kun, ZHANG Yingjie, LIU Yueqin, DUAN Chunhui . Effects of Dietary Digestible Energy and Digestible Crude Protein Levels on Nutrient Apparent Digestibility of Yanshan Cashmere Goats[J]. Chinese Journal of Animal Nutrition, 2018 , 30(10) : 3958 -3967 . DOI: 10.3969/j.issn.1006-267x.2018.10.020

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