Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/5651
Título: Estudo de alguns indices reprodutivos em vacaria de bovinos leiteiros
Autor: Pacheco, Sara Margarida Ferreira
Orientador: Silva, João Nestor das Chagas e
Ortega, Gonçalo Cansado
Palavras-chave: Friesian breed
reproductive traits
calving interval
heat detection
artifitial insemination strategy
Data de Defesa: 2013
Editora: ISA/UTL
Citação: Pacheco, Sara Margarida Ferreira - Estudo de alguns indices reprodutivos em vacaria de bovinos leiteiros. Lisboa: ISA, 2013
Resumo: With an excellent milk production aptitude, the famous black brindles Friesian is the bovine breed with the greatest expansion in the world. During the past three decades, genetic breeding programs have been implemented in dairy cattle. Therefore, reproductive traits have been poor, leading to a steady increase in milk production. The present study aims to find the relationship between high milk production and reproductive effectiveness of Manuel dos Santos Miranda dairy farm. Data were extracted from headcount records, between 2009 and 2011. Primarily, the factors influencing reproductive traits were identified, in order to reveal its action and find possible improvements. Data were graphically treated to investigate parameters such as calving interval (CI), conception rate (CR), interval between calving and conception (ICC) and interval between calving and first insemination (IC1stAI). Although no differences were found in milk production during the study, the high production shown leads to reproductive traits, such as high CI (475 ± 5 days), CR (3.3), ICC (216.5 ± 8 days) and IC1stAI (109 ± 3 days). In comparison with literature, the results showed differences in the study indexes. These were believed to be mainly caused by low heat detection, inappropriate dairy farm management and inaccurate artificial insemination strategy
Descrição: Mestrado em Engenharia Zootécnica - Produção Animal - Instituto Superior de Agronomia / Faculdade de Madicina Veterinária
URI: http://hdl.handle.net/10400.5/5651
Aparece nas colecções:BISA - Dissertações de Mestrado / Master Thesis

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-ESTUDO DE ALGUNS INDICES REPRODUTIVOS EM VACARIA DE BOVINOS LEITEIROS-.pdf1,24 MBAdobe PDFVer/Abrir


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