1701 Effect of high concentrations of crude glycerin on feed intake and growth of feedlot ram lambs. (1st October 2016)

• Record Type: Journal Article
• Authors: Almeida, M.; Bertocco Ezequiel, J. M.; Paschoaloto, J. R.; Perez, H. L.; Carvalho, V. B.; Castro Filho, E. S.; Van Cleef, E. H. C. B.
• Is Part Of: Journal of animal science. Volume 94(2016)Supplement 5
• Page Start: 829
• Page End: 829
• Publication Date: 2016-10-01
• Subjects: by-product -- glycerol -- sheep; Livestock -- Periodicals; Livestock; Electronic journals; Periodicals; 636.005
• DOI: 10.2527/jam2016-1701
• Languages: English
• ISSNs: 0021-8812

Abstract

Abstract: The objective of this study was to evaluate the effects of high concentrations of crude glycerin (CG) on feed intake and growth of finishing lambs. Forty crossbred (Santa Ines × Dorper) ram lambs (21.7 ± 2.7 kg BW and approximately 90 d old) were assigned to a complete randomized block design and fed four isonitrogenous (18.4% CP) and isocaloric (2.7 Kcal ME/kg) experimental diets containing 0, 10, 20, or 30% of CG (83% glycerol), on a dry matter basis. In the diet containing 30% CG, the by-product totally replaced corn grain. The experimental diets were formulated with 30% corn silage and 70% concentrate (corn grain [except the diet with 30% CG], soybean hulls, soybean meal, urea, minerals, and crude glycerin [except the control treatment]). Lambs were housed in a naturally ventilated barn with individual pens, and fed ad libitum twice daily. Animals were weighed at 14-d intervals and were harvested when they reached approximately 35 kg BW. Feed intake and growth were evaluated during the initial (d 0 to d 14), intermediate (d 14 to d 28), and cumulative feedlot period. Data were analyzed using a MIXED procedure, with treatment included as fixed effect and block as random effect. The increasing inclusion of CG in the diets linearly increased days on feed ( P = 0.02). Dry matter intake (DMI) during the initial feedlot period was decreased with CG inclusion (Linear, P = 0.03), while during the intermediate feedlot period, a tendency was observed for DMI to reduce when animals were fed CG (Linear P = 0.09). Regarding the cumulative feedlot period, a quadratic effect was observed on DMI ( P = 0.04), with greater intakes for animals fed treatment containing 10% CG. There was a tendency for reduced average daily gain (ADG) in animals fed CG during initial feedlot period (Linear, P = 0.08). The CG also decreased ADG during intermediate feedlot period ( P = 0.02), and during the cumulative finishing period (Linear, P = 0.003). When all treatments with CG were compared with controls, there was a tendency for reduced ADG during intermediate and cumulative periods ( P = 0.07, P = 0.09, respectively). There was also a tendency for reduced cumulative feed efficiency (Linear, P = 0.07), when CG was added to the diets. In conclusion, adding up to 10% of CG in diets for crossbred finishing lambs improves feed intake and animal growth.