Effect Of Lighting Ways And Dietary Energy Levels On Production Performance And Slaughter Performance Of Shaanbei White Cashmere Goats

The feeding trials, digestive metabolism test and slaughter test were carried out for thestudies of lighting ways and dietary energy levels on performance trait, digestibility of thenutrient and slaughter performance of Shaanbei white cashmere goats, in order to providebasic data reference for promoting the technology of light-control on increasing cashmeregrowth.Seventy-two4-month-old Shaanbei White Cashmere Goats were divided randomly intoequal six groups (n=3) according to lighting ways (natural light and control light) and dietaryenergy levels (lower energy level, medium energy level and higher energy level) and four goatper replicate, which were fed digestible energy (DE)3levels of experimental diets (the digestenergy were set by NRC goat feeding standard recommendation,that was separately80%,90%and100%of the nutrition need standard which expecting to gain150g/d average). Thenatural light groups and the control light groups in same dietary energy treatment were fed thesame experimental diets. The trial period lasted for50d, including preliminary trial period of10d. After the Feeding trials, all the feces and urine were collected for a ten-day digestivemetabolism test (including preliminary trial period of7d). Slaughter test were carried out on6goats respectively selected from the medium energy groups of natural light treatment andcontrol light treatment (two goats of each repeats). The results showed as follows:(1) The lighting ways had no significant effects on average daily gain, feed conversionrate and digestible energy conversion rate(P>0.05). With illumination time reducing, theaverage daily gain and the feed conversion efficiency have a tendency of downward, while thedigestible energy conversion efficiency has a tendency of improve.(2) Along with illumination time reducing, the fat digestibility decreased significantly(p <0.05), while the digestible energy metabolic rate and the digestibility of dry matter,energy, protein, neutral detergent fiber and acid detergent fiber have no significant impact.(3) The rate of water loss and GR-value increased significantly along with illuminationtime reducing (p <0.05). (4) Along with the dietary digestible energy, the average daily gain increased,while thefeed conversion efficiency decreased significantly (P <0.05).(5) Different dietary energy levels had increased significant or extremely significanteffects on nutrient digestibility and digestible energy metabolic rate (p <0.05).