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Contribuição para a caracterização andrológica de ovinos da raça Campaniça
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Resumo(s)
O objetivo deste estudo foi o de caracterizar andrologicamente a raça Campaniça de forma a melhorar as características reprodutivas adequadas à idade e, definir caracteres andrológicos importantes na escolha de reprodutores, como o perímetro escrotal, reduzindo-se a possibilidade da transmissão de características não desejadas à descendência.
Os exames andrológicos foram realizados entre janeiro e maio de 2021, englobando 184 carneiros da raça Campaniça, provenientes de 7 explorações diferentes.
Começou-se o exame andrológico pela recolha da história pregressa do animal, seguido do exame físico e ao trato reprodutivo. A recolha de sémen fez-se com recurso à electroejaculação e determinou-se a mobilidade massal, a mobilidade individual e identificaram-se e contabilizaram-se as formas anómalas dos espermatozoides.
O perímetro escrotal médio, excluindo os animais insatisfatórios e questionáveis, foi de 31,70 cm. Relativamente à bolsa escrotal, 81,52% apresentaram a bolsa sem bilobação, enquanto 11,96% a tinham ligeiramente bilobada, 3,80% bilobada e apenas 2,72%, muito bilobada. A forma dos testículos revelou-se, na sua maioria, ovóide (84,68%), enquanto nos restantes 15,32% ela foi globosa.
O volume médio dos ejaculados foi 1,10 mL e a mobilidade massal média foi 3,73, enquanto a individual foi 65,87%. A anisoespermia média foi 6,31%. O grupo etário com mais anomalias foi o de idade inferior a 2 anos, com cerca de 32,94% de anomalias, enquanto o grupo de idade superior a 6 anos revelou o menor valor registado (cerca de 12,94%).
Dos 184 carneiros em estudo, 151 (82,07%) obtiveram ao exame andrológico, uma classificação de satisfatório, 17 (9,24%) uma classificação de questionável e, 16 de insatisfatório (8,70%), segundo os critérios pré-estabelecidos.
Foi registada uma associação significativa entre a condição corporal e o perímetro escrotal (p<0,001) e entre a condição corporal e a vitalidade dos espermatozoides (p=0,048). A mobilidade individual e a anisoespermia (p<0,001) revelaram uma correlação positiva, assim como a forma testicular e a mobilidade individual (p=0,033) e a forma testicular e a vitalidade dos espermatozoides (p=0,029). Foi igualmente observada uma associação significativa entre a idade e a mobilidade individual (p<0,001), bem como a idade e o perímetro escrotal (p<0,001).
ABSTRACT - Contribution to the Andrological Characterization of Campaniça Rams - The objective of this study is to characterize the Campaniça breed andrologically to improve the age-appropriate productive characteristics and, to define important andrological characters in the choice of sires, like a scrotal perimeter, to prevent them from transmitting unwanted characteristics to offspring. The andrological examinations were performed between January and May 2021, consisting of 184 rams of the Campaniça breed from 7 different farms. The andrological examination began with the collection of the animal's history, followed by a physical examination and examination of the reproductive tract. Semen collection was done by electroejaculation, and mass and individual motility were determined, and abnormal sperm forms were identified and counted. The average scrotal circumference, excluding non-approved and questionable animals, was 31,70cm. Regarding the scrotal sac, 81,52% presented the sac without bilocation, while 11,96% slightly bilobated, 3.80% bilobated and only 2,72% very bilobated. Testicular shape was mostly ovoid, 84,68% while 15,32% globose. The average volume was 1,10 mL, the mass motility, on average, 3,73, while individual 65,87%. The average value of anomalous spermatozoa was 6,31%. The group with the highest number of anomalies was under 2 years of age, accounting for about 32,94% of the alterations, while the group over 6 years of age had the lowest recorded value, about 12,94%. Of the 184 rams under study, 151 (82,07%) obtained a satisfactory classification at examination, 17 (9,24%) a questionable classification, and 16 unsatisfactory (8,70%), according to the established criteria. A significant association was observed between body condition and scrotal circumference (p<0,001) and between body condition and sperm vitality (p=0,048). Individual motility and sperm abnormalities (p<0,001) correlated, as did testicular shape and individual motility (p=0,033) and testicular shape and sperm vitality (p=0,029). A significant association was observed between age relates to individual mobility (p<0,001), as well as age and scrotal perimeter (p<0,001).
ABSTRACT - Contribution to the Andrological Characterization of Campaniça Rams - The objective of this study is to characterize the Campaniça breed andrologically to improve the age-appropriate productive characteristics and, to define important andrological characters in the choice of sires, like a scrotal perimeter, to prevent them from transmitting unwanted characteristics to offspring. The andrological examinations were performed between January and May 2021, consisting of 184 rams of the Campaniça breed from 7 different farms. The andrological examination began with the collection of the animal's history, followed by a physical examination and examination of the reproductive tract. Semen collection was done by electroejaculation, and mass and individual motility were determined, and abnormal sperm forms were identified and counted. The average scrotal circumference, excluding non-approved and questionable animals, was 31,70cm. Regarding the scrotal sac, 81,52% presented the sac without bilocation, while 11,96% slightly bilobated, 3.80% bilobated and only 2,72% very bilobated. Testicular shape was mostly ovoid, 84,68% while 15,32% globose. The average volume was 1,10 mL, the mass motility, on average, 3,73, while individual 65,87%. The average value of anomalous spermatozoa was 6,31%. The group with the highest number of anomalies was under 2 years of age, accounting for about 32,94% of the alterations, while the group over 6 years of age had the lowest recorded value, about 12,94%. Of the 184 rams under study, 151 (82,07%) obtained a satisfactory classification at examination, 17 (9,24%) a questionable classification, and 16 unsatisfactory (8,70%), according to the established criteria. A significant association was observed between body condition and scrotal circumference (p<0,001) and between body condition and sperm vitality (p=0,048). Individual motility and sperm abnormalities (p<0,001) correlated, as did testicular shape and individual motility (p=0,033) and testicular shape and sperm vitality (p=0,029). A significant association was observed between age relates to individual mobility (p<0,001), as well as age and scrotal perimeter (p<0,001).
Descrição
Dissertação de Mestrado Integrado em Medicina Veterinária
Palavras-chave
Andrológico Carneiro Campaniça Electroejaculação Perímetro escrotal Andrological Ram Campaniça Electroejaculation Scrotal Perimeter
Contexto Educativo
Citação
Neves AMSP 2021. Contribuição para a caracterização andrológica de ovinos da raça campaniça [dissertação de mestrado]. Lisboa: FMV-Universidade de Lisboa.
Editora
Universidade de Lisboa, Faculdade de Medicina Veterinária