Different levels of supplied energy for lactating cows affect physicochemical attributes of milk

• Autorzy: Gabbi A.M. , McManus C.M. , Marques L.T. , Abreu A.S. , Machado S.C. , Zanela M.B. , Barbosa R.S. , Fischer V.
• Języki publikacji: EN

Abstrakty

EN

In the period from 2004 to 2011, seven trials on lactating cows were conducted to evaluate the relationship between the amounts of energy required, and milk production and composition. In total, 392 observations on 132 animals were selected due to different levels of energy intake. The observations were classified into three groups according to the amount of total digestible nutrients (TDN) provided by the diets, i.e. 67, 75 and 94% TDN. Such characteristics as proportion of energy provided in relation to cow requirements, experiment duration, daily milk production, and fat, protein and lactose contents, total solids percentage, somatic cell score, titratable acidity and ethanol stability test were considered. Levels of supplied energy were positively related with milk production, ethanol stability and lactose content. Seven variables were regarded as discriminant between levels of supplied energy, including proportion of provided energy related to cow requirement, duration of the experiments, ethanol stability test and milk production, and explained more than 70% of the variance among the observations. Milk production increased linearly with the proportion of the supplied energy from 14, 16 to 19 kg · d−1 per cow, while lactose content increased from 4.37 to 4.56% as the level of TDN attained 93% of estimated requirements. Milk stability increased from 74.2 to 76.4% as the level of TDN attained 79% of estimated requirements. Increased level of the supplied energy related to requirements of lactating cows improved milk yield, milk stability and lactose content.

• Wydawca: -
• Czasopismo: Journal of Animal and Feed Sciences
• Rocznik: 2018
• Tom: 27
• Numer: 1
• Opis fizyczny: p.11-17,fig.,ref.

Twórcy

autor

Gabbi A.M.

• Department of Animal Science, Faculty of Agronomy, Federal University of Rio Grande do Sul, Porto Alegre, 91540-000, RS, Brazil

autor

McManus C.M.

• Institute of Biological Sciences, University of Brasilia, Brasilia, 70910-900, DF, Brazil

autor

Marques L.T.

• Federal University of Pelotas, Pelotas, 96010-610, RS, Brazil

autor

Abreu A.S.

• Riograndense Higher Education Center (CESURG), Sarandi, 99560-000, RS, Brazil

autor

Machado S.C.

• Faculties of Itapiranga, Itapiranga, 89896-000, SC, Brazil

autor

Zanela M.B.

• Brazilian Agricultural Research Corporation EmbrapaTemperate Climate National Centre, Pelotas, 96010-971, RS, Brazil

autor

Barbosa R.S.

• Brazilian Agricultural Research Corporation Embrapa Semi-arid, Petrolina, 56302-970, PE, Brazil

autor

Fischer V.

• Department of Animal Science, Faculty of Agronomy, Federal University of Rio Grande do Sul, Porto Alegre, 91540-000, RS, Brazil

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Identyfikatory

DOI

10.22358/jafs/83703/2018