Banca de DEFESA: JOSÉ FÁBIO DOS SANTOS SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : JOSÉ FÁBIO DOS SANTOS SILVA
DATE: 27/11/2023
TIME: 14:00
LOCAL: REMOTA
TITLE:

USE OF ADITIVES IN DIETS OF THE SHEEP FED BASED AT CLADODES CACTUS (Opuntia cochenillifera)

KEY WORDS:

Additives

weight gain

ionophores

sheep

Cactus cladodes

PAGES: 67
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Produção Animal
SPECIALTY: Criação de Animais
SUMMARY:

The objective was to evaluate the effect of the use of additives in diets based on cactus pear on dry matter intake, ingestive behavior, ruminal parameters, performance, carcass characteristics, tissue composition of the leg and meat quality of feedlot sheep. Thirty-six Santa Inês x SRD crossbred sheep (without defined breed pattern), with an average body weight of 18 kg, were distributed in a completely randomized design. The roughage:concentrate ratio was 65:35 in the diets, with 4 treatments distributed as follows: Control treatment (CON), without adding additives; sodium monensin (MON) treatment with the addition of 50mg sodium monensin per kg of dry matter (DM); virginiamycin treatment (VIR) with addition of 50mg virginiamycin per kg of DM; and sodium monensin + virginiamycin (MON+VIR) treatment with a combination of 50mg of sodium monensin and 50mg of virginiamycin per kg of DM. The roughages used were cactus pear and sugarcane bagasse. Dry matter intake (DMI) was higher (P<0.05) for sheep fed the control diet (CON) and virginiamycin (VIR). The addition of sodium monensin to the diet increased the DMI time (min/kg) (P<0.05) by 55.9% and the combination of sodium monensin + virginiamycin by 99.8%, respectively in relation to the control diet. There was a quadratic effect (P<0.05) for the SCFA percentages as a function of time. The percentage of acetate obtained maximum values at 0h for all diets and minimum values at 6h for the CON diet, 2h for the MON diet and 4h for the VIR and MON+VIR diets. For propionate, the minimum percentage values (P<0.05) were observed at 0h for all diets and maximum at 6h for the CON diet and 2h for the MON, VIR and MON+VIR diets. The acetate:propionate ratio obtained minimum values (P<0.05) at 6h for the CON diet, at 2h for the MON and MON+VIR diets and 4h for the VIR diet. Animals fed the CON and VIR diets had the highest average daily gains and also the highest total weight gains (P<0.05). Sheep fed the VIR and CON diets had the highest (P<0.05) PCQ, PCF, AOL and ICC compared to those fed the MON and MON+VIR diets. The animals fed the CON and VIR diets also obtained the highest leg weights (P<0.05) with weight deposition, about 12 and 20% higher than the animals that consumed the MON and MON+VIR diets. There was an effect (p<0.05) for the amount of subcutaneous and intermuscular fat contained in the leg. The animals that had virginiamycin as the only additive source deposited about 202 grams or 8% of subcutaneous fat in the leg. Equivalent to an increase of 22% for animals that consumed the controlled diet, 38% for sodium monensin + virginiamycin and 40% for sodium monensin. As for intermuscular fat, the VIR and CON diets provided respectively 43 and 37% greater depositions than MON+VIR and 47 and 41% greater than MON. The animals fed the CON and VIR diets also showed higher muscle deposition (P<0.05) in the order of 260 and 220 grams compared to the animals fed the MON diet, and about 390 and 346 grams compared to those fed the MON diet. were fed MON+VIR. However, muscle yield in relation to leg weight was around 68% for all diets. Thus, for the physical characteristics of the meat, there was a difference (p<0.05) for the weight loss by cooking (PPC), the animals fed with the VIR, CON and MON+VIR diets presented the lowest percentages of loss 22.7; 25.9 and 27% respectively. And the animals fed the MON diet had the highest percentage of loss after cooking, 31.21%. The addition of sodium monensin in diets containing forage cactus reduces intake, average weight gain and deposition of muscle and adipose tissue, increasing weight loss by cooking meat in sheep. The monensin + virginiamycin association potentiates the negative effect on consumption, weight gain and tissue deposition

COMMITTEE MEMBERS:
Interno - FRANCISCO FERNANDO RAMOS DE CARVALHO
Externa ao Programa - ***.517.534-** - KELLY CRISTINA DOS SANTOS - UFRPE
Externo à Instituição - DANIEL BARROS CARDOSO
Externo à Instituição - JULIMAR DO SACRAMENTO RIBEIRO - UFAL
Externa à Instituição - ÉRICA CARLA LOPES DA SILVA - UFRPE