Banca de DEFESA: MARINA MONTEIRO DE MORAES SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARINA MONTEIRO DE MORAES SANTOS
DATE: 16/11/2021
TIME: 08:00
LOCAL: INSTITUTO DE ZOOTECNIA
TITLE:

Phenotypic Analysis of Equidae's Coatings and Particularities

KEY WORDS:

Agribusiness, phenotype, review.

PAGES: 134
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUMMARY:

SANTOS, Marina Monteiro de Moraes Santos. Phenotypic Analysis of Equidae's Coatings and Particularities. 2021. 122p. Dissertation (Master in Zootechnics, Equine Production). Animal Science Institute, Department of Animal Production, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, 2021. Coat is the name given to the color of the sum of the skin's coat, fur, mane, tail and extremity. The coats of equidae can present particularities, which are markings of variable shape and length, distributed in different parts of the body. The particularities can be observed in any coat, but do not alter its definition. Both the coats and the particularities are used for identification and registration of equines in the Breeders' Association, as well as for zootechnical guidance for mating and mating, in order to increase the percentage of desirable coats and avoid associated genetic diseases. The objective was to identify and characterize the coats and particularities of equines, aiming to standardize the existing nomenclatures, identify the frequency of particularities in each coat, verify the changes in the coat of equine foals and mule foals during the first six months of life and verify the frequency of coats within the Mangalarga Marchador and Campolina breeds. One thousand horses of both sexes and of different breeds and ages were evaluated, in person, and the database provided by the Association of Breed Horse Breeders Mangalarga Marchador and Campolina was used. During data collection, the horses were photographed to identify the coats and particularities and fill in the detailed review for each horse. To verify changes in the coat of the foals of horses and mules, photographs were taken once a month from birth to six months of age. The data collected from each animal were described in a qualitative spreadsheet that was later transformed into quantitative data using Microsoft Excel®. Statistical analyzes were performed descriptively and using frequency and compared using the chi-square test. As for the foals, the description of all phenotypic changes presented over the 6 months was performed. All analyzes were performed using R-Studio® software. A total of 449 equestrian horses, 316 Mangalarga Marchador horses, 103 Campolina horses, 60 ponies, 33 Quarter Horses, 28 mules, 07 Bretã horses and 04 donkeys were identified. The pigments observed were pheomelanin and eumelanin. And the basic coats observed were: sorrel, yellowberry, apalusa, bay, brown, cream, leopard, lobe, oveiro, pampa, rat hair, black, roan, roan and gray. Among these coats, 42 variations were also identified. The particularities observed were: twirls, spikes, black ear edge, chin, star, light, string, thread, bark, beta, baby in white, high shoes, medium shoes, low shoes, white hooves and mixed hooves. The highest frequency of coats in the studied horses was related to brown coat and the lowest frequency of leopard coat. Regarding the particularities, the one with the highest frequency in equidae were head twirls and the lowest frequency was related to the particularity of spikes on the head.

 

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