饲粮能氮比对简州大耳羊生长性能及养分消化代谢的影响

doi:10.16431/j.cnki.1671-7236.2022.07.010

Abstract

Abstract: 【Objective】 The experiment was conducted to study the effects of complete pellet diet energy to nitrogen ratio (ME/N) and gender on growth performance, nutrient digestion and metabolism of Jianzhou Da'er goats in house feeding.【Method】 Using 2×4 two factors experimental design, 64 five-month-old healthy Jianzhou Da'er goats were selected,32 males (26.56 kg±2.96 kg) and 32 females (25.75 kg±2.46 kg) were randomly divided into 4 groups respectively, with 8 goats in each group, and they were fed complete pellet diets with the ME/N of 0.59, 0.51, 0.43 and 0.35,respectively. After 5 days transition and 10 days adaption, 30 days feeding trial were carried out, after that, 4 goats were selected in each group according to the average weight for a 11-day digestion and metabolism trial, the total collection of feces and urine was conducted for 4 days after a 7-day adaptation.【Results】 ①The ADG and DMI of the test goats were affected by ME/N significantly (P＜0.05), and ADG was the hightest (259 g/d±58 g/d) when ME/N was 0.43. ADG and DMI in test rams were significantly higher than those in ewes (P＜0.05). There was a significant interaction between dietary ME/N level and gender on DMI (P＜0.05). ②UE was increased significantly (P＜0.05), GEI, FE, DE and apparent digestibility of GE had no significant difference (P＞0.05) with the decrease of ME/N. GEI,FE and DE in test rams were significantly higher than those in ewes (P＜0.05).③NI and N apparent digestibility were significantly increased with the decrease of dietary ME/N (P＜0.05). NI,NR,NPU and BV in test rams were significantly higher than those in ewes (P＜0.05). ④The apparent digestibility of EE and ADF increased first and then decreased (P＜0.05), while the others had no significant change (P＞0.05) with the decrease of ME/N. The apparent digestibility of DM, P, ADF and NDF in test rams were higher than that in ewes (P＜0.05). There was no significant interaction between dietary ME/N level and gender on nutrient apparent digestibility (P＞0.05).【Conclusion】 When the dietary energy concentrations were the same, reducing ME/N (increasing N concentration) appropriately could improve the growth performance of Jianzhou Da'er goats during growing-fattening period, but continuously reducing ME/N could not improve the growth performance, nutrient digestion and metabolism of the goats. Under this experimental conditions, the complete pellet diet with an ME/N of 0.43 was more suitable. Rams had better digestion and metabolism of nutrients and growth performance than ewes during the growth and fattening period.

Key words: energy to nitrogen ratio; Jianzhou Da'er goats; apparent digestibility; energy metabolism; nitrogen metabolism

CLC Number:

S827.5

FU Min, CHEN Tianbao, LAI Jingwen, OUYANG Yiting, CHEN Min, ZENG Hongliang. Effects of Dietary Energy to Nitrogen Ratios on Growth Performance, Nutrient Digestibility and Metabolism of Jianzhou Da'er Goats[J]. China Animal Husbandry and Veterinary Medicine, 2022, 49(7): 2523-2533.

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Effects of Dietary Energy to Nitrogen Ratios on Growth Performance, Nutrient Digestibility and Metabolism of Jianzhou Da'er Goats

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