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Contraste leiteiro: ferramenta de monitorização para uma maior eficiência das explorações de bovinos leiteiros

Authors: Domingues, Inês Mota;

Contraste leiteiro: ferramenta de monitorização para uma maior eficiência das explorações de bovinos leiteiros

Abstract

Os resultados do contraste leiteiro são uma ferramenta de gestão. Desequilíbrios nutricionais, metabólicos e infecciosos podem ser diagnosticados pela concentração de β-hidroxibutirato(BHB), azoto ureico(MUN), gordura, proteína, relação gordura/proteína e células somáticas(SCC) do leite. O objetivo é avaliar a variação destes parâmetros segundo fatores não-nutricionais e a inter-relação entre estes. Analisou-se 110461 amostras de 9523 vacas recolhidas mensalmente entre janeiro de 2015 e março de 2017 em 27 efetivos do sul de Portugal. Ajustou-se dois modelos lineares generalizados mistos para determinar os fatores associados à concentração de BHB e MUN serem superiores a 0,2mmol/L e 300mg/kg, respetivamente. Verificou-se um considerável efeito dos fatores não-nutricionais, embora variável consoante o fator e o parâmetro. Os modelos demonstraram que a produção de leite, fase e número de lactação e a relação gordura/proteína influenciam a concentração de BHB e MUN. A concentração de BHB também é influenciada pela SCC e gordura, a MUN pela proteína; MILK RECORDING: MONITORING TOOL FOR GREATER DAIRY FARMS EFFICIENCY ABSTRACT: Milk recording results are a management tool. Nutritional, metabolic and infectious disorders can be diagnosed by β-hydroxybutyrate(BHB), milk urea nitrogen(MUN), fat, protein, relation fat/protein and somatic cells concentration in milk. The objective is analyzed the variation of these parameters according to non-nutritional factors and the interrelation between them. This study analyzed 110,461 samples of 9,523 cows collected monthly from January 2015 to March 2017 from 27 herds of South of Portugal. Two generalized linear mixed regression models were constructed to determine non-nutritional factors associated with concentration of BHB and MUN greater than 0,2mmol/L and 300mg/kg, respectively. There was a considerable effect of non-nutritional factors, although variable according to factor and parameter. Models show that milk production, stage and number of lactation, and relation fat/protein influenced BHB and MUN concentration. BHB concentration is also influenced by somatic cells and milk fat, MUN concentration by milk protein.

Country
Portugal
Related Organizations
Keywords

Contraste leiteir, Milk recording, Milk urea nitrogen, Fatores não-nutricionais, B-hidroxibutirato, B-hydroxybutyrate, Non-nutritional factors, Azoto ureico

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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Average
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