Banca de DEFESA: CLAIRTON BRUNO RODRIGUES DE MORAIS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : CLAIRTON BRUNO RODRIGUES DE MORAIS
DATE: 18/12/2023
TIME: 09:30
LOCAL: Remoto
TITLE:

DIGESTIBILITY AND GAS PRODUCTION KINETICS OF TIFTON 85 HAY IN TWO MATURATION STAGES BY EQUIDES

KEY WORDS:

Donkeys, Total feces collection, Equines, In vitro.

PAGES: 61
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Produção Animal
SPECIALTY: Criação de Animais
SUMMARY:

This research aimed to verify whether donkeys of the Nordestino ecotype were more efficient than horses in the apparent digestibility and gas production kinetics of Tifton 85 hay in two stages of maturation. Four donkeys of the Nordestino ecotype and four horses were used, in a completely randomized design in a 2 x 2 factorial scheme, two equid species and hay from Tifton 85 in two stages of maturation, Hay 1 with the highest content of non-fibrous carbohydrates (CNF) and lower content of fibrous carbohydrates (CF). The experiment was divided into two periods of 29 days, reaching 58 days. The first three days were wash-out, 21 days of diet consumption and on the final five days the digestibility test was carried out using the total feces collection method. At the end of each period, feces were collected in the rectal ampoule to perform the in vitro technique. There was a difference between species only in the apparent digestibility coefficients of CP and PIDN of Hay 2, with higher values for horses. For both hays, a shorter latency period was observed for the degradation of carbohydrates by the donkeys. Both species presented a higher total volume of gases (Vt1) in Hay 1. The volume of gases produced by the degradation of the A+B1 fraction (Vf1) was greater in Hay 1, indicating greater CNF fermentation. Regarding the volume of gases produced by the degradation of fraction B2 (Vf2), a greater volume of gases produced in Hay 2 was observed, indicating greater fermentation of CF. Furthermore, horses presented a higher value for Vf1 and greater gas production up to 96 hours of incubation in Hay 1. In Hay 2, gas production by donkeys was greater. It was concluded that donkeys were not more efficient than horses in digesting the nutrients present in Tifton 85 hay, as they increased the rate of passage of food through the digestive tract. On the other hand, the microorganisms present in the digestive tract of donkeys are more efficient in using lower quality fiber.

COMMITTEE MEMBERS:
Presidente - JULIANO MARTINS SANTIAGO
Externa à Instituição - CHIARA ALBANO DE ARAUJO OLIVEIRA
Externa à Instituição - MARIA LINDOMÁRCIA LEONARDO DA COSTA