Banca de DEFESA: URIAS FAGNER SANTOS NASCIMENTO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : URIAS FAGNER SANTOS NASCIMENTO
DATE: 12/07/2022
TIME: 14:00
LOCAL: Google Meet (https://meet.google.com/whe-pwix-opy)
TITLE:

Evaluation of morphometric, morphological characteristics and mineral composition of Dorper and Santa Inês sheep hoods

KEY WORDS:

horny case, minerals, morphology, mineral supplementation

PAGES: 86
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUBÁREA: Clínica e Cirurgia Animal
SPECIALTY: Clínica Veterinária
SUMMARY:

Among the main health problems that affect sheep farming, foot injuries are often associated with economic losses, being the third leading cause of complaint among producers, such as diseases that affect the herds, second only to endoparasites and reproductive diseases. Knowledge about the dimensions of the hooves and their functional aspects has been increasingly necessary, since the conformation of the hooves can interfere with the longevity, lameness and production of the animals. Because they are the only means of contact between animals and the ground, they function as shock absorbers and guarantee the stability and transmission of the locomotion impulse, the hooves are subject to several external factors that can lead to their early wear, abnormal growth and the installation of infectious agents.  Among the factors that predispose to the occurrence of foot diseases, we can mention mineral deficiencies that are common in herds and can be corrected with dietary supplementation. However, there may be differences in mineral concentrations depending on the breeds, management adopted in the properties, physiological state and age of the animals. The objective of this work was to describe, measure and determine the mineral composition of the hooves of healthy Dorper and Santa Inês sheep. 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 from the condition that none of the animals had received, during their lifetime, interventions or treatments that could interfere with the natural wear of hooves. The animals came from known farms, raised in a semi-intensive regime, kept in Panicum maximum cv Massai pasture during the day. The animals were slaughtered in a slaughterhouse under state inspection, in the municipality of Iatabaiana, State of Sergipe, as recommended by the Ministry of Agriculture, Livestock and Supply. 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®) the 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 wall thickness of the hoof, sole and bulb, an incision was made along the coronal edge of the hooves with the aid of a hand saw, in order to remove adjacent and fixative structures 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 carried out using a Shimadzu model Ray Ny EDX-720 energy dispersive X-ray fluorescence spectrometer. The voltage applied to the X-ray tube was 15 keV and 50 keV, current 100 μA with detector dead time of 40% and collimator of 10 mm. Spectra were obtained sequentially from 0 to 40 keV. The traction 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 performed on an Instron 3367 universal mechanical testing machine, following the recommendations of ASTM E8/E8M-21 (2021). 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 hindlimbs, 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 greater load when submitted to the resistance test the load variable was significantly influenced (p<0.05) by race (Table 1). It was observed that the Dorper breed supported a higher load than the Santa Inês breed. Regarding 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 Dorper animals when compared to the animals Santa Inês.

BANKING MEMBERS:
Interno - 2073025 - HUBER RIZZO
Externa à Instituição - NATÁLIA CARRILLO GAETA
Externo à Instituição - RONALDO GOMES GARGANO
Externo à Instituição - MÁRIO FELIPE ALVAREZ BALARO
Externo à Instituição - VITOR SANTIAGO DE CARVALHO