Banca de DEFESA: URIAS FAGNER SANTOS NASCIMENTO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : URIAS FAGNER SANTOS NASCIMENTO
DATE: 28/02/2023
TIME: 13:00
LOCAL: Google Meet (https://meet.google.com/ywc-byro-xwh)
TITLE:

Evaluation of morphometric and morphological characteristics and mineral composition of dorper and santa inês sheep hooves

KEY WORDS:

horny case, minerals, morphophysiology, mineral supplementation

PAGES: 90
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUBÁREA: Clínica e Cirurgia Animal
SPECIALTY: Clínica Veterinária
SUMMARY:

The objective of this work was to describe, measure and determine the mineral composition of the hooves of healthy Dorper and Santa Inês sheep, between 150 and 180 days old, reared in a semi-intensive system. Right thoracic and pelvic limbs of twenty sheep were used, ten of the Dorper breed and ten of the Santa Inês breed, belonging to two herds, selected on the condition that none of the animals had received interventions or treatments during their lifetime that could interfere in the natural wear of the hooves. The animals came from farms in the municipalities of Aquidabã and Nossa Senhora da Glória, in the state of Sergipe, and were kept on pasture of Panicum maximum cv Massai during the day and collected in beaten ground pens at night. The animals were slaughtered in a slaughterhouse under state inspection, in the municipality of Iatabaiana, Sergipe. After slaughter, the fore and hind limbs on the right side of the animals were selected for hoof measurements. The nails were disarticulated after being immersed in water at 60º C for 10 minutes and, with the aid of a Zaaz precision electronic caliper (Amatools®), measurements of the wall height of the abaxial and axial face of the hooves, periople height, length and sole width and hoof bulb length and width. To obtain the thickness of the hoof wall, sole and bulb, an incision was made along the coronary edge of the hooves with the aid of a manual saw, in order to remove adjacent structures and fasteners to the bones of the corresponding distal phalanges. In addition, with the aid of a protractor, the angle of the hooves of each limb was measured. The determination of mineral composition was performed using an energy dispersive X-ray fluorescence spectrometer model Ray Ny EDX-720 from Shimadzu. The voltage applied to the X-ray tube was 15 keV and 50 keV, current 100 μA with detector dead time of 40% and 10 mm collimator. Spectra were obtained sequentially from 0 to 40 keV. The tensile test was performed on 5 hoof samples of each breed. The specimens made had a total length of 40 mm and a width of 10 mm, the distance between grips was 10 mm and the test speed was 1 mm/minute until the sample ruptured. The tests were carried out in an Instron 3367 universal mechanical testing machine, following the recommendations of the ASTM E8/E8M-21 (2021) standard. It was verified that there are morphological differences between the hooves of the forelimbs of Dorper and Santa Inês sheep, especially in the measurements of periople height, wall thickness and hoof angle of the forelimbs and in all measurements of the pelvic limbs, except for the width of the sole. The hooves of Dorper animals concentrate higher values of K, Ca, P, Mg, S in addition to higher levels of Fe, Zn, Cu and Mn, in addition to supporting a greater load when subjected to the resistance test The load variable was significantly influenced ( p<0.05) by races. It was observed that the Dorper breed supported a greater load than the Santa Inês breed. With regard to effort, it did not differ significantly (p>0.05). It was concluded that there are morphological differences between the hooves of Dorper and Santa Inês sheep and that the levels of potassium, calcium, phosphorus, magnesium, sulfur, iron, zinc, copper and manganese were higher in animals of the Dorper breed when compared to animals Santa Inês.

COMMITTEE MEMBERS:
Presidente - HUBER RIZZO
Externa ao Programa - 2364647 - CAROLINA AKIKO SATO CABRAL DE ARAUJO - UFRPEExterno à Instituição - RONALDO GOMES GARGANO
Externo à Instituição - VITOR SANTIAGO DE CARVALHO - UFBA
Externa à Instituição - NATÁLIA CARRILLO GAETA