A carregar...
Publicação
Sexo da cria : terá ele alguma influência sobre os parâmetros produtivos e a patologia da lactação da vaca Holstein Frísia?
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 2.06 MB | Adobe PDF |
Orientador(es)
Resumo(s)
Numa exploração de bovinos de aptidão leiteira, a maioria da receita gerada deverá ser
proveniente do comércio da matéria prima produzida: o leite. Interessa, portanto, possuir uma
exploração/empresa sustentável, de forma a maximizar o lucro, (entre outros factores, tal
como por exemplo, o bem-estar animal); especialmente devido ao facto de, no caso da
indústria leiteira, o preço do leite ser flutuante e definido pelas unidades de recolha.
O objectivo do presente trabalho experimental foi o de averiguar a influência do sexo da cria
bovina na performance leiteira da vaca Holstein Frísia, considerando a lactação subsequente
ao parto; bem como a influência do sexo da cria nos teores butiroso e proteico do leite, para
essa mesma lactação. Esta análise retrospectiva visou, ainda, apurar se existiria alguma
relação entre o sexo da cria e a ocorrência de patologia na fêmea, na lactação supracitada.
As lactações analisadas foram provenientes de fêmeas primíparas e multíparas, ou seja,
fêmeas que se encontravam entre a primeira e a sexta lactação, inclusive. No total, foram
analisadas 1.416 lactações, provenientes de 596 vacas.
Foi verificado que existe uma influência do sexo da cria na produção leiteira aos 305 dias de
lactação. Quando ocorre o nascimento de uma única fêmea, a produção leiteira é de
12.098,69 kg, sendo que quando ocorre o nascimento de um macho é de 11.979,42 kg.
Foi confirmado que não existe influência do sexo da cria no teor butiroso do leite, tal como
não existe influência do sexo da cria no teor proteico do leite.
Por fim, foi verificado que não existe influência do sexo da cria na ocorrência de patologia. No
caso de a cria ser um macho, a proporção de ocorrência de patologia é de 0,43. Quando a
cria é fêmea, a proporção de ocorrência de patologia é de 0,39.
As conclusões mais importantes deste trabalho experimental são o facto de existir influência
do sexo da cria na produção leiteira aos 305 dias de lactação e, não existir influência do sexo
da cria na ocorrência de patologia.
ABSTRACT - Calf Sex: does it have any influence on the productive parameters and on the lactation’s pathology of the Holstein Friesian cow? - In a dairy farm, the majority of the revenue generated must come from the trade of the raw material produced: milk. It is therefore appropriate to have a sustainable holding in order to maximize profit, (among other factors, such as animal welfare); especially because that in the dairy industry, milk prices fluctuate and are defined by milk collection units. The main goal of the present experimental study was to verify the calf sex’s influence in the milk yield of the Holstein Friesian cow, considering lactation subsequent to calving; as well as the influence of the sex of the offspring on the fat and protein content of the milk, for the same lactation. This retrospective analysis was also aimed to determine if there was any relationship between the sex of the offspring and the occurrence of pathology in the female, in the abovementioned lactation. The lactations analyzed came from primiparous and multiparous females, that is, females that were between the first and sixth lactation, inclusive. In total, 1,416 lactations from 596 cows were analyzed. It was verified that the sex of the calf has a positive influence on the 305 days milk yield. When the birth of a single female occurs, the milk yield is 12.098,69 kg, and when a male calf is born, the milk yield is 11.979,42 kg. It has also been confirmed that there is no influence of the sex of the offspring on the fat content of milk, and there is also no influence of calf’s sex on the milk protein content. Finally, it was verified that there is no influence of the sex of the offspring on the occurrence of pathology. In the case of a male calf, the proportion of occurrence of pathology is 0.43. When the calf is female, the proportion of occurrence of pathology is 0.39. The most important conclusions of this experimental study are the fact that the sex of the calf has a positive influence on the 305 days milk yield, and that there is no influence of the calf sex on the occurrence of pathology.
ABSTRACT - Calf Sex: does it have any influence on the productive parameters and on the lactation’s pathology of the Holstein Friesian cow? - In a dairy farm, the majority of the revenue generated must come from the trade of the raw material produced: milk. It is therefore appropriate to have a sustainable holding in order to maximize profit, (among other factors, such as animal welfare); especially because that in the dairy industry, milk prices fluctuate and are defined by milk collection units. The main goal of the present experimental study was to verify the calf sex’s influence in the milk yield of the Holstein Friesian cow, considering lactation subsequent to calving; as well as the influence of the sex of the offspring on the fat and protein content of the milk, for the same lactation. This retrospective analysis was also aimed to determine if there was any relationship between the sex of the offspring and the occurrence of pathology in the female, in the abovementioned lactation. The lactations analyzed came from primiparous and multiparous females, that is, females that were between the first and sixth lactation, inclusive. In total, 1,416 lactations from 596 cows were analyzed. It was verified that the sex of the calf has a positive influence on the 305 days milk yield. When the birth of a single female occurs, the milk yield is 12.098,69 kg, and when a male calf is born, the milk yield is 11.979,42 kg. It has also been confirmed that there is no influence of the sex of the offspring on the fat content of milk, and there is also no influence of calf’s sex on the milk protein content. Finally, it was verified that there is no influence of the sex of the offspring on the occurrence of pathology. In the case of a male calf, the proportion of occurrence of pathology is 0.43. When the calf is female, the proportion of occurrence of pathology is 0.39. The most important conclusions of this experimental study are the fact that the sex of the calf has a positive influence on the 305 days milk yield, and that there is no influence of the calf sex on the occurrence of pathology.
Descrição
Dissertação de Mestrado Integrado em Medicina Veterinária
Palavras-chave
Sexo da cria produção leiteira aos 305 dias teor butiroso teor proteico patologia da lactação vacas Holstein Frísia calf sex 305 days milk yield fat content protein content lactation’s pathology Holstein Friesen cows
Contexto Educativo
Citação
Beirão, C.M.C. (2018). Sexo da cria : terá ele alguma influência sobre os parâmetros produtivos e a patologia da lactação da vaca Holstein Frísia? Dissertação de mestrado. Universidade de Lisboa, Faculdade de Medicina Veterinária, Lisboa.
Editora
Universidade de Lisboa, Faculdade de Medicina Veterinária