主　　编：张崇志

出　　版：Asian-Australas J Anim Sci Vol. 32, No. 4:541-547 April 2019

作品内容：

Effects of photoperiod on nutrient digestibility, hair follicle activity  and cashmere quality in Inner Mongolia white cashmere goats

Chong Zhi Zhang1 , Hai Zhou Sun1,*, Sheng Li Li1 , Dan Sang1 , Chun Hua Zhang1 ,  Lu Jin1 , Marco Antonini2 , and Cun Fa Zhao1

Objective: This study investigated the effects of photoperiod on nutrient digestibility, hair  follicle (HF) activity and cashmere quality in Inner Mongolia white cashmere goats. 

 Methods: Twenty-four female (non-pregnant) Inner Mongolia white cashmere goats aged  1 to 1.5 years old with similar live weights (mean, 20.36±2.63 kg) were randomly allocated  into two groups: a natural daily photoperiod group (NDPP group:10 to 16 h light, n = 12) and  a short daily photoperiod group (SDPP group: 7 h light:17 h dark, n = 12). All the goats were  housed in individual pens and fed the same diets from May 15 to October 15, 2015. The digestibility of crude protein (CP), dry matter (DM), and neutral detergent fiber (NDF) were measured in different months, along with secondary hair follicle (SHF) activity, concentration of  melatonin (MEL), and cashmere quality.

Results: Although there was no significant difference in the live weights of goats between  the SDPP and NDPP groups (p>0.05), the CP digestibility of goats in the SDPP group was  significantly increased compared to the NDPP group in July, September, and October (p<0.05).  For the DM and NDF digestibility of goats, a significant increase (p<0.05) was found during  in September in the SDPP group. Furthermore, compared to the NDPP group, the SHF activity  in July, the MEL concentration in July, and the cashmere fiber length and fiber weight in  October were significantly increased in the SDPP group (p<0.05).  Conclusion: The cashmere production of Inner Mongolia white cashmere goats was increased  without obvious deleterious effects on the cashmere fibers in the SDPP group (metabolizable  energy, 8.34 MJ/kg; CP, 11.16%; short daily photoperiod, 7 h light:17 h dark). 

Keywords: Cashmere Goat; Digestibility; Melatonin; Photoperiod; Secondary Hair Follicle

原文

页　　数：7

开　　本：

定　　价：