INTAKE, NITROGEN BALANCE AND MICROBIAL PROTEIN SYNTHESIS OF STEERS FED WITH OR WITHOUT LIPID ADDITION

被引：0

作者：

Bendia, Laila Cecilia Ramos ^{[1
]}

de Alencar Fontes, Carlos Augusto ^{[1
]}

Processi, Elizabeth Fonseca ^{[1
]}

Silveira Filho, Clovis Carlos ^{[1
]}

Lombardi, Claudio Teixeira ^{[1
]}

Silveira Pimentel, Paulo Roberto ^{[2
]}

Oliveira, Ronaldo Lopes ^{[2
]}

Bezerra, Leilson Rocha ^{[3
]}

Rocha, Tiago Cunha ^{[4
]}

机构：

[1] State Univ North Fluminense Darcy Ribeiro, Dept Anim Sci, Rio De Janeiro, Brazil

[2] Univ Fed Bahia, Dept Anim Sci, Salvador, BA, Brazil

[3] Univ Fed Campina Grande, Ctr Hlth & Agr Technol, Patos de Minas, Paraiba, Brazil

[4] State Univ Tocantina Reg Maranhao, Imperatriz, Maranhao, Brazil

来源：

BIOSCIENCE JOURNAL | 2020年 / 36卷 / 04期

关键词：

Corn silage; Nitrogen balance; Ruminal ammonia; Soybeans; Soybean oil; LACTATING DAIRY-COWS; PURINE DERIVATIVES; EXCRETION; DIETS; CATTLE; DIGESTION; DIGESTIBILITY; FERMENTATION; EFFICIENCY; RUMINANTS;

D O I：

10.14393/BJ-v36n4a2020-42294

中图分类号：

S [农业科学];

学科分类号：

09 ;

摘要：

This study investigated the influence of energy supplementation with or without the addition of lipids on microbial production, microbial synthesis efficiency and nitrogen balance. Eight fistulated steers were used with accessible rumens and kept in individual stalls. Their diets consisted of corn silage; corn silage + concentrate; corn silage + concentrate with addition of lipids in the form of soybean oil; and corn silage + concentrate with addition of lipids in the form of soybean grains. Estimates of microbial protein synthesis were obtained based on the urinary excretion of purine derivatives. The concentrations of ammonia in the rumen were determined immediately at 2, 4, 6 and 8 hours after feeding. The diets with concentrate increased (P<0.05) the microbial protein synthesis and the efficiency of the synthesis and nitrogen balance without a difference between the lipid sources (P>0.05). Concentrated diets presented higher concentrations of urea nitrogen in the serum and urinary urea excretion (P<0.05), but there was no difference between the lipid sources (P>0.05). Energy supplementation, with or without lipid addition, can be used as a strategy to increase the synthesis of the microbial protein in the cattle fed corn silage.

引用

页码：1306 / 1314

页数：9

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