[ Objective] In order to study incubation conditions of Tibetan chickens in low altitude areas. [ Method] Eggs of Tibetan chicken were transported to low altitude areas in highland areas for artificial hatching. [ Res...[ Objective] In order to study incubation conditions of Tibetan chickens in low altitude areas. [ Method] Eggs of Tibetan chicken were transported to low altitude areas in highland areas for artificial hatching. [ Results] The results showed that the average hatching rate of fertilized eggs was 85.33% ; the average healthy chick rate was 91.77 % ; the average primary body mass was 31.2l g. Hatching rate of eggs in group 2 was the highest, which reached 90.52%, the aver- age egg mass was 43.25 g and the average egg shape index was 1.32. Hatching rate of eggs in group 2 was 13.11% and 2.47% higher than that in group 1 and group 3 respectively, which was 5.19% higher than the average value. Hatching rate and healthy chick rate of eggs in group 2 also showed the same trend. [ Conclusion] High hatching effect could be obtained under the better hatching condition in low altitude areas in highland areas.展开更多
[Objective] The paper was to study the effects of diet formulation with different nutrition levels on growth and slaughter performance ofblack muscovy duck at the age of 43-91 days. [Method] Totally 288 individuals of...[Objective] The paper was to study the effects of diet formulation with different nutrition levels on growth and slaughter performance ofblack muscovy duck at the age of 43-91 days. [Method] Totally 288 individuals of 43dayold black muscovy duck were randomly divided intonine treatments, four repeats each treatment and eight ducks each repeat. UsingL9 （34） orthogonal experiment design （four factors and three levels）,three metabolic energy levels （12.32, 12.72, 13.12 MJ/kg）, three crude protein levels （14%, 16%, 18%）, three calcium levels （0.6%, 0.8%, 1.0%）and three available phosphorus levels （0.30%, 0.45%, 0.6%） were designed, and a total of nine feeding groups （C1C9） were designed according todifferent nutritional levels. Through combination of feeding test （49 d） and metabolic test （pretest 4 d and formal test 3 d）, the growth performance,meat performance and apparent nutrient digestibility of ducks were determined. [Result] The ducks in experimental group C2 had the highest average daily gain, the lowest feed gain ratio, the largest body oblique length, chest width, chest depth and tibia length, which had significant or extremely significant differences with other groups （P〈0.05 or P〈0.01）. The slaughter rate, semieviscerated rate, eviscerated rate and meat quality ofducks in C2 group were higher （P〈0.05）. The apparent digestibility of crude protein and dietary metabolic energy in C2 group were 88.68% and63.07%, respectively, both were significantly or extremely significantly higher than the other groups（P〈0.05 or P〈0.01）, while the interaction effectof calcium and phosphorus level on apparent digestibility was not obvious. [Conclusion] Under the experimental conditions, the suitable metabolicenergy, crude protein, calcium, available phosphorus and total phosphorus levels of 43 -91 days old black muscovy ducks were 12.32 MJ/kg,16.10%, 0.92%, 0.45% and 0.68%, respectively.展开更多
基金Supported by Taizhou Science and Technology Support Project of Jiangsu Province(No.TN201326)
文摘[ Objective] In order to study incubation conditions of Tibetan chickens in low altitude areas. [ Method] Eggs of Tibetan chicken were transported to low altitude areas in highland areas for artificial hatching. [ Results] The results showed that the average hatching rate of fertilized eggs was 85.33% ; the average healthy chick rate was 91.77 % ; the average primary body mass was 31.2l g. Hatching rate of eggs in group 2 was the highest, which reached 90.52%, the aver- age egg mass was 43.25 g and the average egg shape index was 1.32. Hatching rate of eggs in group 2 was 13.11% and 2.47% higher than that in group 1 and group 3 respectively, which was 5.19% higher than the average value. Hatching rate and healthy chick rate of eggs in group 2 also showed the same trend. [ Conclusion] High hatching effect could be obtained under the better hatching condition in low altitude areas in highland areas.
基金Supported by Science and Technology Support Plan(Agriculture)Project of Taizhou City(TN201503)
文摘[Objective] The paper was to study the effects of diet formulation with different nutrition levels on growth and slaughter performance ofblack muscovy duck at the age of 43-91 days. [Method] Totally 288 individuals of 43dayold black muscovy duck were randomly divided intonine treatments, four repeats each treatment and eight ducks each repeat. UsingL9 （34） orthogonal experiment design （four factors and three levels）,three metabolic energy levels （12.32, 12.72, 13.12 MJ/kg）, three crude protein levels （14%, 16%, 18%）, three calcium levels （0.6%, 0.8%, 1.0%）and three available phosphorus levels （0.30%, 0.45%, 0.6%） were designed, and a total of nine feeding groups （C1C9） were designed according todifferent nutritional levels. Through combination of feeding test （49 d） and metabolic test （pretest 4 d and formal test 3 d）, the growth performance,meat performance and apparent nutrient digestibility of ducks were determined. [Result] The ducks in experimental group C2 had the highest average daily gain, the lowest feed gain ratio, the largest body oblique length, chest width, chest depth and tibia length, which had significant or extremely significant differences with other groups （P〈0.05 or P〈0.01）. The slaughter rate, semieviscerated rate, eviscerated rate and meat quality ofducks in C2 group were higher （P〈0.05）. The apparent digestibility of crude protein and dietary metabolic energy in C2 group were 88.68% and63.07%, respectively, both were significantly or extremely significantly higher than the other groups（P〈0.05 or P〈0.01）, while the interaction effectof calcium and phosphorus level on apparent digestibility was not obvious. [Conclusion] Under the experimental conditions, the suitable metabolicenergy, crude protein, calcium, available phosphorus and total phosphorus levels of 43 -91 days old black muscovy ducks were 12.32 MJ/kg,16.10%, 0.92%, 0.45% and 0.68%, respectively.
