动物营养学报 >

2020 , Vol. 32 >Issue 10: 4922 - 4930

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.10.043

反刍与草食动物营养与饲料 RUMINANT AND HERBIVORE NUTRITION AND FEED

饲粮磷水平对空怀期云南半细毛羊养分排泄和氮平衡的影响

  • 欧阳依娜 ,
  • 薛白 ,
  • 王思宇 ,
  • 梁家充 ,
  • 李银江 ,
  • 李卫娟 ,
  • 洪琼花
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  • 1. 云南省畜牧兽医科学院, 昆明 650224;
    2. 四川农业大学动物营养研究所, 温江 611130
欧阳依娜(1979-),女,云南昆明人,副研究员,博士,从事反刍动物营养研究。E-mail:yinaouyang@126.com

收稿日期: 2020-04-22

  网络出版日期: 2020-10-22

基金资助

国家现代农业绒毛用羊产业技术体系专项资金资助（CARS-39）；省科技人才和平台计划（2018IC108）；云南省科技创新人才计划（2018HC017）

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Effects of Dietary Phosphorus Level on Nutrient Excretions and Nitrogen Balance of Yunnan Semi-Fine Wool Sheep during Non-Pregnancy Period

  • OUYANG Yina ,
  • XUE Bai ,
  • WANG Siyu ,
  • LIANG Jiachong ,
  • LI Yinjiang ,
  • LI Weijuan ,
  • HONG Qionghua
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  • 1. Yunnan Animal Science and Veterinary Institute, Kunming 650224, China;
    2. Animal Nutrition Institute, Sichuan Agricultural University, Wenjiang 611130, China

Received date: 2020-04-22

  Online published: 2020-10-22

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摘要

本试验旨在研究饲粮磷水平对空怀期云南半细毛羊氮、钙、磷排泄和氮平衡的影响。选择体况良好、体重（46.36±2.77） kg、38月龄的经产2胎空怀期云南半细毛羊50只，按体重随机分为5组，每组10只，每只羊为1个重复。5组试验羊分别饲喂磷水平为0.19%、0.32%、0.45%、0.56%和0.64%的饲粮，饲粮其他营养水平基本保持一致。所有试验羊进行为期44 d的饲养试验，其中预试期14 d，正试期30 d。在正试期第9天从各组中选取5只母羊，放入代谢笼中预饲3 d，在第12~16天（5 d）进行消化代谢试验。结果表明：1）饲粮磷水平对氮总排泄量和尿氮排泄量的影响不显著（P>0.05）；0.45%磷水平组粪氮排泄量显著高于0.32%磷水平组（P<0.05），与0.19%、0.56%和0.64%磷水平组差异不显著（P>0.05）。2）随着饲粮磷水平的升高，磷总排泄量和粪磷排泄量极显著升高（P<0.01）；尿磷排泄量以0.64%磷水平组最高，0.19%磷水平组最低，而0.32%、0.45%和0.56%磷水平组间差异不显著（P>0.05）。3）钙总排泄量和粪钙排泄量均以0.19%磷水平组最高，显著高于0.45%、0.56%和0.64%磷水平组（P<0.05），以0.64%磷水平组最低，极显著低于其他各组（P<0.01）；尿钙排泄量以0.32%磷水平组最高，显著高于0.19%、0.56%和0.64%磷水平组（P<0.05），以0.56%磷水平组最低，显著低于其他各组（P<0.05）。4）0.19%、0.32%和0.45%磷水平组干物质采食量显著高于0.56%和0.64%磷水平组（P<0.05）；0.19%磷水平组食入氮和沉积氮极显著高于其他各组（P<0.01），0.32%和0.45%磷水平组食入氮显著高于0.56%和0.64%磷水平组（P<0.05），沉积氮在0.32%、0.45%、0.56%和0.64%磷水平组间无显著差异（P>0.05）；氮沉积率以0.19%磷水平组最高，显著高于0.45%、0.56%和0.64%磷水平组（P<0.05），与0.32%磷水平组差异不显著（P>0.05）；5个组试验羊的氮平衡均为正氮平衡。综上所述，饲粮磷水平在0.19%~0.32%时既可以提高空怀期云南半细毛羊的沉积氮和氮沉积率，又有利于减少氮、磷排泄量，降低环境污染。

关键词： 磷; 云南半细毛羊; 空怀期; 养分排泄; 氮平衡

本文引用格式

欧阳依娜 , 薛白 , 王思宇 , 梁家充 , 李银江 , 李卫娟 , 洪琼花 . 饲粮磷水平对空怀期云南半细毛羊养分排泄和氮平衡的影响[J]. 动物营养学报, 2020 , 32(10) : 4922 -4930 . DOI: 10.3969/j.issn.1006-267x.2020.10.043

Abstract

The current study was conducted to evaluate the effects of dietary phosphorus (P) level on excretions of nitrogen (N), calcium (Ca) and phosphorus (P) and N balance of non-pregnant Yunnan semi-fine wool sheep during non-pregnant period. Fifty healthy non-pregnant multiparous Yunnan semi-fine wool sheep at the age of 30 months and with the body weight of (46.36±2.77) kg were randomly divided into 5 groups with 10 replicates per group and 1 ewe per replicate. The P levels of diets for 5 groups were 0.19%, 0.32%, 0.45%, 0.56% and 0.64%, respectively, and other nutrient levels in the diets were essentially consistent. The experiment lasted for 44 d. There was a pretrial period of 14 d followed by an experimental period of 30 d. On the 9th day of the experimental period, five ewes were randomly selected from each group for digestion and metabolism experiment with a 3-d pretrial period by a 5-d trial period (the 12th to 16th day). The results showed as follows: 1) dietary P level had no significant effects on the excretions of total N and urine N (P>0.05). Fecal N excretion in 0.45% P level group was significantly higher than that in 0.32% P level group (P<0.05); however, there was no significant difference compared with 0.19%, 0.56% and 0.64% P level groups (P>0.05). 2) Excretions of total P and fecal P were significantly increased with the dietary P level increasing (P<0.01). Urine P excretion was the highest in 0.64% P level group and the lowest in 0.19% P level group (P<0.01), while there was no significantly difference among 0.32%, 0.45% and 0.56% P level groups (P>0.05). 3) Excretions of total Ca and fecal Ca were the highest in 0.19% P level group, which was significantly higher than those in 0.45%, 0.56% and 0.64% P level groups (P<0.05). The lowest excretions of total Ca and fecal Ca were observed in 0.64% P level group, which was significantly lower than those in other groups (P<0.01). Similarly, urine Ca excretion was the highest in 0.32% P level group, which was significantly higher than that in 0.19%, 0.56% and 0.64% P level groups (P<0.05); however, the lowest urine Ca excretion was found in 0.56% P level group, which was significantly lower than that in other groups (P<0.05). 4) Dry matter intake (DMI) in 0.19%, 0.32% and 0.45% P level groups was significantly higher than that in 0.56% and 0.64% P level groups (P<0.05). N intake and N retention in 0.19% P level group were significantly higher than those in other groups (P<0.01), and the N intake in 0.32% and 0.45% P level groups was significantly higher than that in 0.56% and 0.64% P level groups (P<0.05). There was no significant difference in the N retention among 0.32%, 0.45%, 0.56% and 0.64% P level groups (P>0.05). The highest N retention rate was observed in 0.19% P group, which was significantly than that in 0.45%, 0.56% and 0.64% P level groups (P<0.05); however, there was no significant difference between 0.19% and 0.32% P level groups (P>0.05). Nitrogen balance in the 5 groups was positive. According to above findings, when the dietary P level is 0.19% to 0.32%, it is beneficial to enhance the N retention and N retention rate of Yunnan semi-fine wool ewes during non-pregnancy period, decrease the excretions of N and P, and reduce environmental pollution.

Key words： phosphorus; Yunnan semi-fine wool sheep; non-pregnancy period; nutrient excretions; nitrogen balance

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