Zhang Chong Zhi, Sun Hai Zhou, Li Sheng Li, Sang Dan, Zhang Chun Hua, Jin Lu, Antonini Marco, Zhao Cun Fa
Institute for Animal Nutrition and Feed, Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences, Hohhot, 010031, China.
Italian National Agency for new Technology, Energy and Sustainable Economic Development, ENEA UTAGRI Inn CR Casaccia, Roma, Italy.
Asian-Australas J Anim Sci. 2019 Apr;32(4):541-547. doi: 10.5713/ajas.18.0154. Epub 2018 Aug 27.
This study investigated the effects of photoperiod on nutrient digestibility, hair follicle (HF) activity and cashmere quality in Inner Mongolia white cashmere goats.
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.
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).
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).
本研究调查了光照周期对内蒙古白绒山羊营养物质消化率、毛囊（HF）活性及羊绒品质的影响。
将24只年龄为1至1.5岁、体重相近（平均20.36±2.63千克）的非妊娠雌性内蒙古白绒山羊随机分为两组：自然每日光照周期组（NDPP组：光照10至16小时，n = 12）和短每日光照周期组（SDPP组：光照7小时：黑暗17小时，n = 12）。所有山羊均单独饲养在围栏中，并于2015年5月15日至10月15日饲喂相同日粮。在不同月份测量粗蛋白（CP）、干物质（DM）和中性洗涤纤维（NDF）的消化率，以及次级毛囊（SHF）活性、褪黑素（MEL）浓度和羊绒品质。
虽然SDPP组和NDPP组山羊的体重无显著差异（p>0.05），但SDPP组山羊在7月、9月和10月的CP消化率相比NDPP组显著提高（p<0.05）。对于山羊的DM和NDF消化率，SDPP组在9月显著提高（p<0.05）。此外，与NDPP组相比，SDPP组在7月的SHF活性、7月的MEL浓度以及10月的羊绒纤维长度和纤维重量均显著增加（p<0.05）。
在SDPP组（代谢能8.34兆焦/千克；CP 11.16%；短每日光照周期，光照7小时：黑暗17小时）中，内蒙古白绒山羊的羊绒产量增加，且对羊绒纤维无明显有害影响。
