Banca de DEFESA: NATALIA GOMES LACERDA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : NATALIA GOMES LACERDA
DATE: 31/05/2022
TIME: 14:00
LOCAL: Sala virtual
TITLE:

Açaí seed as a source of roughage in the diet of feedlot cattle

 

KEY WORDS:

by-products, fiber, consumption, rumen parameters, rumen kinetics

PAGES: 40
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Nutrição e Alimentação Animal
SPECIALTY: Avaliação de Alimentos para Animais
SUMMARY:

The alternative foods as source of roughage in feedlots of beef cattle can be an important strategy to reduce costs and labor with traditional roughages production (ex. silages). However, nutritional parameters and efficiency of nutrients utilization needs to be evaluated to help produces make a right decision. In addition, the use of these industrial by-products in animal nutrition can contribute to reduce the environmental liabilities that do not have an adequate destination. Thus, two experiments were carried out at the Federal Rural University of Amazon, which the objective was evaluated açaí seed as a source of roughage in diets of feedlot beef cattle. The first experiment evaluated the effects of two methods of supplying açaí seed (AS) as a roughage source (coarsely broken or whole) on intake, digestibility, and rumen parameters. Four ruminally fistulated crossbred Nellore bulls averaging 340 ± 31 kg of body weight were used in two simultaneous 2 × 2 Latin square design. The dry matter (DM), crude protein (CP) and neutral detergent fiber (NDF) intake was higher to animals fed coarsely broken açaí. The digestibility of DM and nutrients was not affected. Acetate, total volatile fatty acid concentrations, and the acetate:propionate ratio were greater to animals coarsely broken açaí fed. However whole açaí seed provides greater pH value. The second experiment evaluated differents levels of broken açaí seed (BAS) inclusion (0; 5; 10; 15 and 20%) in diet of beef cattle feedlot on intake, digestion, ruminal degradation kinetics and fiber passage and efficiency of nitrogen utilization. Five ruminally fistulated crossbred Nellore bulls (average weight 387±27) were used in 5 x 5 Latin square design. A tendency towards a linear effect was observed for dry matter (DM) intake (P < 0.10) and a linear effect was observed for intake of organic matter (OM), crude protein (CP) and neutral detergent fiber (NDF). Total nutrient digestibility and fecal starch content were not affected by the inclusion of açai seed (P>0.05). NDF digestibility decreased linearly (P<0.05). Ruminal and intestinal digestibilities were not altered (P<0.05). Ruminal ammonia nitrogen was reduced and a quadratic effect was observed for pH, with means greater than 0 and 20% (P>0.05). There was a linear increase in the concentration of acetate in the rumen (P<0.05) and a trend of linear increase in the total concentration of VFA and butyrate (P<0.10). However, the acetate:propionate ratio was not altered (P>0.05). The passage and rate of DM degradation were not affected by the inclusion of broken açaí seeds (P>0.05). A linear effect was observed for nitrogen intake in the inclusion of broken açaí seeds (P<0.05). The inclusion of broken açaí seeds as a fiber source in feedlot beef cattle diets increases intake without affecting digestibility (with the exception of NDF), passage rate, digestion and nitrogen utilization efficiency. Increases acetate concentration and reduces ruminal ammonia nitrogen.

BANKING MEMBERS:
Presidente - 1839209 - DAIANY IRIS GOMES
Interna - 1354679 - KALIANDRA SOUZA ALVES
Externo ao Programa - 1632663 - LUIS RENNAN SAMPAIO OLIVEIRA
Externo ao Programa - 1143911 - RAYLON PEREIRA MACIEL
Externa à Instituição - IVANNA MORAES DE OLIVEIRA - UNESP
Externa à Instituição - FABRICIA ROCHA CHAVES MIOTTO - UFG
Externa à Instituição - LUANA MARTA DE ALMEIDA RUFINO - UNIFESSPA