Resumo

CARDENAS-RAMIREZ, Lino Rigoberto et al. Effect of selenium source on productive behavior, serum and muscle selenium content, and serum level of albumin, α-, β- and ∂-globulins in Pelibuey sheep. Rev. mex. de cienc. pecuarias [online]. 2023, vol.14, n.2, pp.476-487.  Epub 26-Jun-2023. ISSN 2448-6698.  https://doi.org/10.22319/rmcp.v14i2.6244.

The objective was to compare the effects of sodium selenite (SS) and Sel-Plex® (SP) on dry matter intake (DMI), daily weight gain (DWG), feed conversion (FC), carcass yield, Se in serum, muscle, albumin, and globulins in Pelibuey lambs. Fifty (50) animals (LW=23.0 ± 1.1 kg; 5 to 6 mo) were stratified and randomly assigned to one of five treatments (n=10): 1) Basal diet, C); 2) C + 0.30 mg kg-1 DM of SS, 30SS; 3) C + 0.90 mg kg-1 DM of SS, 90SS; 4) C + 0.30 mg kg-1 DM of SP, 30SP; and 5) C + 0.90 mg kg-1 DM of SP, 90SP. There was no effect (P>0.05) on DMI; while 90SP and 30SS showed higher DWGs (293 and 260 vs 245, 243, and 230 g d-1; P<0.05) compared to the other treatments. FC was better for 90SP and C. Final LWs, carcass yields and dorsal fat were not affected (P>0.05). In the Longissimus dorsi, 30SP increased (P<0.05) Se with respect to 90SP and C and was similar with 30SS and 90SS. There was no effect (P>0.05) on the Gluteus maximus and Musculus deltoideus. Albumin was higher with 30SP and 90SS; while α-globulin was higher with 30SS and 90SP. In conclusion, 0.90 mg of SP improved DWG and FC. Selenite and SP increased Se in serum up to 0.30, and it decreased with 0.90 mg per kilogram of SP. In the Longissimus dorsi, Se was improved in 30SP with respect to 90SP and C and was not similar to 90SS and 30SS. The organic Se of 90SP improved the level of albumin and α-globulins.

Palavras-chave : Selenium sources; Weight gain; Carcasses; Albumin; α-globulin; Longissimus dorsi et lumborum; Growing sheep.