This study investigated effects of dietary ifbre and grit on growth performance, gastrointestinal tract （GIT） development, serum indexes and grit retention of Sichuan white goslings in China. The experiment was a 3&...This study investigated effects of dietary ifbre and grit on growth performance, gastrointestinal tract （GIT） development, serum indexes and grit retention of Sichuan white goslings in China. The experiment was a 3×2 factorial design consisting of dietary crude ifbre （CF） at 2.0, 4.0 and 6.0%levels by adding grass meal and with or without grit supplementation. A total of 720 1-d-old male goslings were randomly allocated into 36 pens of 20 goslings/pen （n=6 pens/treatment）. At 21 d of age, GIT, blood samples and grit in gizzards were collected. Body weight （BW）, empty BW （without GIT）, average daily gain （ADG） and average daily feed intake （ADFI） were affected by CF levels and the medium （4.0%） had the highest value. Adding grit improved BW, empty BW, ADG and ADFI. CF affected relative weight or length of proventriculus, gizzard and duodenum. Increasing CF levels decreased jejunum villus height and affected caecal crypt depth and villus height to crypt depth ratio. Higher CF levels decreased serum triglyceride. Adding grit increased relative weight of abdominal fat. Grit addition increased grit weight in gizzard and the ratio of grit in 0.45-1 and 1-2 mm while decreasing the ratio of grit〈0.45 and 2-3 mm. In conclusion, moderate CF level and grit addition increased performance of goslings without interaction. Dietary CF levels affected the development of upper GIT and serum triglyceride. Grit needed by goslings should be less than 2 mm. Goslings’ gizzard would accumulate grit from feed when other grit could not be acquired.展开更多
本实验取3批实验室试制的卵黄抗体,琼扩效价为1∶16,按0.5 m L/只接种1、3日龄易感雏鹅,分别在注射抗体后1、3、5和7日攻毒,观察攻毒保护情况。结果显示:1日龄雏鹅注射抗体后1日攻毒保护率为96.67%,3日攻毒保护率为100%,5日攻毒保护率为...本实验取3批实验室试制的卵黄抗体,琼扩效价为1∶16,按0.5 m L/只接种1、3日龄易感雏鹅,分别在注射抗体后1、3、5和7日攻毒,观察攻毒保护情况。结果显示:1日龄雏鹅注射抗体后1日攻毒保护率为96.67%,3日攻毒保护率为100%,5日攻毒保护率为86.67%,7日攻毒保护率为76.67%;3日龄雏鹅注射抗体后1日攻毒保护率为100%,3日攻毒保护率为96.67%,5日攻毒保护率为86.67%,7日攻毒保护率为80%。以免疫攻毒保护率不低于80%为标准,本研究确定小鹅瘟病毒卵黄抗体的被动免疫保护期为5日,随着时间的延长,保护作用逐渐减弱。展开更多
基金financially supported by the China Agriculture Research System (CARS-43-14)the Special Fund for Agro-scientific Research in the Public Interest, China (201303143)
文摘This study investigated effects of dietary ifbre and grit on growth performance, gastrointestinal tract （GIT） development, serum indexes and grit retention of Sichuan white goslings in China. The experiment was a 3×2 factorial design consisting of dietary crude ifbre （CF） at 2.0, 4.0 and 6.0%levels by adding grass meal and with or without grit supplementation. A total of 720 1-d-old male goslings were randomly allocated into 36 pens of 20 goslings/pen （n=6 pens/treatment）. At 21 d of age, GIT, blood samples and grit in gizzards were collected. Body weight （BW）, empty BW （without GIT）, average daily gain （ADG） and average daily feed intake （ADFI） were affected by CF levels and the medium （4.0%） had the highest value. Adding grit improved BW, empty BW, ADG and ADFI. CF affected relative weight or length of proventriculus, gizzard and duodenum. Increasing CF levels decreased jejunum villus height and affected caecal crypt depth and villus height to crypt depth ratio. Higher CF levels decreased serum triglyceride. Adding grit increased relative weight of abdominal fat. Grit addition increased grit weight in gizzard and the ratio of grit in 0.45-1 and 1-2 mm while decreasing the ratio of grit〈0.45 and 2-3 mm. In conclusion, moderate CF level and grit addition increased performance of goslings without interaction. Dietary CF levels affected the development of upper GIT and serum triglyceride. Grit needed by goslings should be less than 2 mm. Goslings’ gizzard would accumulate grit from feed when other grit could not be acquired.
文摘本实验取3批实验室试制的卵黄抗体,琼扩效价为1∶16,按0.5 m L/只接种1、3日龄易感雏鹅,分别在注射抗体后1、3、5和7日攻毒,观察攻毒保护情况。结果显示:1日龄雏鹅注射抗体后1日攻毒保护率为96.67%,3日攻毒保护率为100%,5日攻毒保护率为86.67%,7日攻毒保护率为76.67%;3日龄雏鹅注射抗体后1日攻毒保护率为100%,3日攻毒保护率为96.67%,5日攻毒保护率为86.67%,7日攻毒保护率为80%。以免疫攻毒保护率不低于80%为标准,本研究确定小鹅瘟病毒卵黄抗体的被动免疫保护期为5日,随着时间的延长,保护作用逐渐减弱。
