Effects of feeding selenium-yeast and chromium-yeast to finishing lambs on growth, carcass characteristics, and blood hormones and metabolites

• Published in: Animal feed science and technology Vol. 152; no. 1; pp. 42 - 49
• Main Authors: Domínguez-Vara, I.A., González-Muñoz, S.S., Pinos-Rodríguez, J.M., Bórquez-Gastelum, J.L., Bárcena-Gama, R., Mendoza-Martínez, G., Zapata, L.E., Landois-Palencia, L.L.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 10-06-2009; [New York, NY]: Elsevier Science; Elsevier
• Subjects: animal growth; Biological and medical sciences; Blood; blood chemistry; Blood hormones; Carcass; carcass characteristics; Chromium; chromium-yeast; dietary mineral supplements; dietary minerals; Feed and pet food industries; feed supplements; finishing; Food industries; Fundamental and applied biological sciences. Psychology; hormones; lamb feeding; lambs; Meat and meat product industries; metabolites; Plasma metabolites; Rambouillet; ruminant nutrition; Selenium; selenium-yeast; Yeast; yeasts; Yeast; ADG; BW; T 3; IgG; Blood hormones; Chromium; Plasma metabolites; T 4; Selenium; Carcass; FE; Hormone; Farming animal; Growth; Metabolite; Meat product; Inorganic element; Lamb; Blood; Heavy metal; Feeding; Vertebrata; Meat animals; Mammalia; Sheep; Artiodactyla; Ungulata
• ISSN: 0377-8401; 1873-2216
• DOI: 10.1016/j.anifeedsci.2009.03.008

Fifty-four male Rambouillet lambs (27
±
4.8
kg body weight) fed a finishing diet and a daily supplement of selenium-yeast (0 or 0.3
mg Se-yeast) and chromium-yeast (0, 0.25, or 0.35
mg Cr-yeast) were used in a complete randomized design with a factorial (2×3) arrangement of treatments. Growth, feed intake, carcass characteristics, plasma triglycerides, cholesterol, glucose, urea-N, insulin, cortisol, thyroxine (T
4), and triiodothyronine (T
3), and serum immunoglobulin G (IgG) concentrations were measured. Daily weight gain, total weight gain, feed intake, and feed conversion were not affected by Se-yeast supplementation. There was a linear decrease in feed intake, but a linear increase of the 12th rib area, retained protein, and plasma glucose as the Cr-yeast supplementation increased in lambs without Se-yeast supplement. There were quadratic effects of Cr-yeast on plasma triglycerides and insulin concentrations, carcass fat and protein, retained fat and energy, and fat free carcass in lambs without Se-yeast. Final BW, total gain, and average daily gain were linearly increased as Cr-yeast increased in Se-yeast supplemented lambs. Cr-yeast affected all carcass variables in Se-yeast supplemented lambs. Quadratic effects of Cr-yeast were observed on slaughter BW, hot and cold carcass, 12th rib area, and retained energy in lambs fed Se-yeast. Fat (g/kg BW) and retained fat (kg) in carcass showed a linear reduction as Cr-yeast increased in lambs fed Se-yeast. Thus, carcass and retained protein, as well as fat free carcass decreased linearly as Cr-yeast supplementation increased. These results suggest that Se-yeast and Cr-yeast interact to enhance growth, modify carcass characteristics and affect blood hormones and metabolites of lambs.