Data/hora: 20/06/2024 02:48:24

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 05/04/2019
Data da última atualização: | 05/04/2019
Autoria: | GOUVEA, V. N.; BATISTEL, F.; SOUZA, J.; CHAGAS, L. J.; SITTA, C.; CAMPANILI, P. R. B.; GALVANI, D. B.; PIRES, A. V.; OWENS, F. N.; SANTOS, F. A. P.
Afiliação: | USP/ESALQ - Piracicaba, SP, Brazil; USP/ESALQ - Piracicaba, SP, Brazil; USP/ESALQ - Piracicaba, SP, Brazil; USP/ESALQ - Piracicaba, SP, Brazil; USP/ESALQ - Piracicaba, SP, Brazil; USP/ESALQ - Piracicaba, SP, Brazil; DIEGO BARCELOS GALVANI, CNPC; USP/ESALQ - Piracicaba, SP, Brazil; DuPont Pioneer - USA; USP/ESALQ - Piracicaba, SP, Brazil.
Título: | Flint corn grain processing and citrus pulp level in finishing diets for feedlot cattle.
Ano de publicação: | 2016
Fonte/Imprenta: | Journal of Animal Science, v. 94, n. 2, p. 665-677, Feb. 2016.
DOI: | 10.2527/jas.2015-9459
Idioma: | Inglês
Conteúdo: | Abstract: Four trials were conducted to evaluate the effects of flint corn processing and the replacement of corn with citrus pulp (CiP) in diets for Nellore feedlot cattle. In a 103-d finishing trial, 216 Nellore bulls (350 ± 24 kg initial BW) were used in a randomized complete block design with a 2 × 4 factorial arrangement of treatments. Factors included 2 processing methods, either ground corn (GC) or steam-flaked corn (FC), with CiP replacing each corn type at 4 levels (0, 25, 50, and 75% of DM). All diets contained 12% sugarcane bagasse and 88% concentrate (DM basis). Treatments were also evaluated in metabolism trials, in which 10 ruminally cannulated Nellore steers (389 ± 37 kg) were assigned to 2 independent but simultaneous 5 × 5 Latin squares, each using 1 method of corn processing (GC and FC). Interactions ( < 0.05) between corn processing and CiP inclusion level were observed for final BW, DMI, ADG, G:F, and HCW. With FC-based diets, added CiP linearly decreased final BW ( = 0.04), whereas with GC-based diets, added CiP quadratically increased final BW ( = 0.002). With FC-based diets, the inclusion of CiP linearly increased DMI ( = 0.03) and linearly decreased ADG ( = 0.03) and G:F ( = 0.001). Increasing CiP in GC-based diets quadratically increased DMI ( = 0.001), ADG ( = 0.005), and HCW ( = 0.003). In FC-based diets, CiP inclusion had no effect on HCW ( = 0.21). Dressing percent, LM area, and 12th-rib fat were not affected by diet ( ? 0.05). For steers fed GC diets, CiP inclusion in the diet quadratically decreased the molar proportion of isovalerate ( = 0.001) but linearly increased ruminal butyrate ( = 0.006). No differences ( ? 0.16) were observed for total VFA concentrations, acetate:propionate ratio, and ruminal NH-N as CiP replaced GC. For steers fed FC diets, the molar proportion of acetate linearly increased ( = 0.002) whereas the proportion of propionate was linearly decreased ( < 0.001), resulting in a linear increase ( = 0.001) in the acetate:propionate ratio. Replacing corn with CiP linearly reduced NEm ( = 0.001) and NEg ( < 0.001) of FC-based diets but did not affect ( = 0.15) NE values of CG-based diets. Steam flaking flint corn improved cattle performance in this trial more than has been reported for dent corn in the published literature.
Palavras-Chave: | Animal Nutritional Physiological Phenomena; Ruminal parameters.
Thesagro: | Zea Mays.
Thesaurus Nal: | Animal feeding; Animal nutrition; Bagasse; Beef cattle; Byproducts; Cellulose; Dietary minerals; Food handling; Gas production (biological); Pectins; Ruminant nutrition; Starch; Steam.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (39038-1) - UPC - AP - DD -  -  -  - DIS