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Dried corn distillers grains with solubles (DDGS) can partially replace grains and forages in diets for ruminants. The objective of this research was to evaluate the effect of replacing grains and soybean meal with DDGS (0%, 15%, 30% and 45%) in the diet of lambs. Thirty-two native lambs were used (initial bodyweight = 28.6 ± 2.19 kg) in a completely randomized design. Initial body weight was a co-variable, and the means were compared with the Tukey test. The dry matter intake was significantly higher in DDGS containing diet than in the control treatment. The daily weight gain was higher in the diets with 15% of DDGS compared with the control. Dry matter digestibility was lower by 7% with 45% of DDGS. The hot and cold carcass weights were significantly higher by 8% in DDGS treatments compared to the control. The inclusion of increasing levels of DDGS in the diet of fattening lambs increased their dry matter intake, improved carcass weight, and did not adversely affect carcass characteristics.

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Requirements of lambs for choline and methionine have not been clearly established, but because of their metabolic relationship, the availability of these two nutrients may affect protein synthesis and energy balance. Therefore, a trial was carried out to evaluate the effect on productive performance and blood metabolites of including methionine and choline from polyherbal mixtures in finishing lamb diets. Forty Hampshire x Suffolk lambs weighing 26.9 ± 2.8 kg were used for a 45-day experiment. The treatments were arranged as a 2x2 factorial, in which the factors were dietary supplementation with herbal methionine and choline at two levels (0% and 0.4% of dry matter (DM)). The treatments had no effects on the lambs’ productive variables (daily feed intake, average daily gain, and feed to gain ratio), carcass characteristics and lipid metabolites (P >0.05). The results indicated that the inclusion of polyherbal mixtures containing methionine, choline and their combination at 0.4% of DM in finishing lamb diets showed no benefits in productive response or in blood metabolites related to lipid metabolism. Keywords: amino acid, lipid metabolites, productive performance, ruminally protected, vitamin

El objetivo del estudio fue evaluar el contenido de proteína cruda (PC) y proteína verdadera (PV) de la caña de azúcar después del proceso de fermentación en estado sólido (FES) con y sin adición de urea o un inóculo de Pediococcus acidilactici, Lindner. Se utilizaron nueve silos aerobios donde se evaluaron tres tratamientos: caña integral molida (CIM), CIM más 2% de urea (CIMu) y CIM inoculada con 108 UFC de P. acidilactici (CIMbal). Se midió el pH, niveles de PC y PV, así como cambios en las poblaciones microbianas. El pH fue superior a 6.1, con excepción de CIMu donde fue menor (5.6; p<0.05). Las cantidades de PC y PV fueron bajas, sin diferencia entre tratamientos hasta el final del periodo de incubación (72 h). Se observaron bajas cantidades de bacterias ácido-lácticas (BAL) en CIMu, sin diferencias en CIM y CIMbal (p>0.05). En los periodos de 48 y 72 h la cantidad de bacterias celulolíticas y totales fueron similares (p>0.05) entre tratamientos. La FES de la caña de azúcar permite conservar forraje, pero en el corto plazo no mejora el contenido de PC y PV en la materia seca (MS), incluso con la adición de probiótico o urea.

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