Guilherme Joner

Meat lipid profile of steers finished in pearl millet pasture with different rates of concentrate

The objective of this work was to evaluate the meat lipid profile from Devon beef steers finished in pearl millet (Pennisetum americanum) pasture and fed at different rates of concentrate supplementary diet. Twelve steers weighing 270 kg, at 12‑month‑average initial age, were randomly distributed into three treatments: pearl millet pasture; and pearl millet pasture plus a concentrate equivalent at 0.5 or 1.0% of body weight, with two replicates. Total contents of saturated and unsaturated fatty acids, the polyunsaturated:saturated ratio and other relevant fatty acids as the vaccenic acid, conjugated linoleic acid, omega‑3, and omega‑6 were not affected by the consumption of a concentrate supplement at 0.5 or 1.0% live weight. However, the 0.5% supplementation level reduced the concentration of dihomo‑γ‑linolenic fatty acid (C20: 3 n‑6), while the 1.0% supplementation level elevated the content of docosahexaenoic (DHA) (C22: 6 n‑3) fatty acid, and the omega‑6:omega‑3 ratio in meat. Consumption of up to 1.0% energy supplementation increases the omega‑6:omega‑3 ratio in meat from Devon steers grazing on pearl millet pasture.

Suplementação com gordura protegida para vacas de corte desmamadas precocemente mantidas em pastagem natural

The objective of this work was to evaluate the productive and reproductive performance of beef cows, as well as the performance of their calves according to the following dietary treatments: PRE: supplemented with protected fat (PF) during 45 days prepartum; PREPOS: supplemented with PF during 45 days prepartum and 63 days postpartum; POS: supplemented with PF during 63 days postpartum; PN: without supplementation. The productive performance of cows was not influenced by feed management (P>0.05), except for body condition score (BCS), which was lower for PRE and PREPOS cows at the end of mating season, with the latter cows having similar BCS POS and PN. The calving interval (CI) was shorter for cows supplemented in PREPOS  376 days , and did not differ in cows maintained in PN  383 days. Supplemented PREPOS cows weaned 4.4% more pounds of calf per 100kg of cow at calving  22.6kg  than the PRE and POS cows  21.6kg and 21.6kg, respectively  and 8,4% more pounds of calf per 100 of cow at calving than the cows maintained in native pasture  20.7kg. The fat protected supplementation during pre and/or postpartum periods did not affect the performance of cows and calves.

External body components and internal fat of Charolais or Nellore steers, fed with different concentrate level

The objective was to evaluate the development of external body components and the distribution of internal fat of Charolais (CH) and Nellore (NE) steers, fed with different concentrate level in the diet. The steers were distributed in six treatments constituted by three concentrate level: 35, 50 or 65% (dry matter basis) and two genetic group (Charolais or Nellore). NE steers fed with 65% concentrate in diet showed higher EBW yield, it was not different to CH and NE steers fed with 50% concentrate. Head weigth in relation to EBW was decrease with the increase of the proportions concentrate (4.67, 4.30 and 1 Zootecnista, Depto de Zootecnia, Universidade Federal de Santa Maria, UFSM, Av. Roraima, 1000, Camobi, 97105-900. Santa Maria, RS. E-mail: mg_ or@yahoo.com.br 2 Engo Agro, Prof. do Depto de Zootecnia, UFSM, Santa Maria, RS. E-mail:darialves lho@hotmail.com 3 Zootecnista, Discente de Pos-Doutorado da Universidade Federal de Goias, UFG, Goiânia, GO. E-mail: regisluismissio@hotmail. com 4 Zootecnista, Profa. Colegio Agricola de Frederico Westphalen,UFSM, Frederico Westphlen, RS. E-mail:patimetz@hotmail.com 5 Engo Agro, Prof. Visitante, UFG, Goiânia, GO. E-mail: jorestle@terra.com.br 6 Zootecnista(s), M.e. Discente(s) de Doutorado, UFSM, Santa Maria, RS. E-mail: luzoot@hotmail.com; mcalisson@yahoo.com. br 7 Discente de Zootecnia da UFSM, Santa Maria, RS. E-mail:jonerzootecnista@yahoo.com.br * Autor para correspondencia