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

  • Zhang, Chong Zhi (Institute for Animal Nutrition and Feed, Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences) ;
  • Sun, Hai Zhou (Institute for Animal Nutrition and Feed, Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences) ;
  • Li, Sheng Li (Institute for Animal Nutrition and Feed, Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences) ;
  • Sang, Dan (Institute for Animal Nutrition and Feed, Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences) ;
  • Zhang, Chun Hua (Institute for Animal Nutrition and Feed, Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences) ;
  • Jin, Lu (Institute for Animal Nutrition and Feed, Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences) ;
  • Antonini, Marco (Italian National Agency for new Technology, Energy and Sustainable Economic Development, ENEA UTAGRI Inn CR Casaccia) ;
  • Zhao, Cun Fa (Institute for Animal Nutrition and Feed, Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences)
  • Received : 2018.02.22
  • Accepted : 2018.08.08
  • Published : 2019.04.01

Abstract

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, $20.36{\pm}2.63kg$) 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

Acknowledgement

Supported by : Inner Mongolia natural science foundation

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