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| Freitas Júnior,José Esler de; Rennó,Francisco Palma; Santos,Marcos Veiga dos; Gandra,Jefferson Rodrigues; Maturana Filho,Milton; Venturelli,Beatriz Conte. |
| The objective of this study was to evaluate the use of fat sources in rations for lactating cows on the productive performance and composition of milk protein fraction. Twelve Holstein cows were used, grouped in three balanced 4 × 4 Latin squares, fed with the following rations: control; refined soybean oil; whole raw soybean; and calcium salts of unsaturated fatty acid (Megalac-E). Dry matter and nutrient intake, and daily milk production were evaluated. The samples used to analyze milk composition were collected in two alternate days and were obtained from two daily milking. Milk composition and total nitrogen, non-protein nitrogen and non-casein nitrogen ratios were analyzed. The casein, serum protein and true protein ratios were obtained by difference.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fat supplementation; Intake; Milk production and composition; Non-protein nitrogen; True protein. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000400021 |
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| Vilela,Márcio da Silva; Ferreira,Marcelo de Andrade; Azevedo,Marcílio de; Farias,Iderval; Torres,Luiz Carlos Leal; Guimarães,Amanda Vasconcelos. |
| The aim of this study was to evaluate the effect of the manner in which diet is supplied and spineless cactus forage is processed on intake, nutrient digestibility, milk production and composition, concentration of plasma urea nitrogen (PUN) in the milk urea nitrogen (MUN) and production of microbial protein in Holstein cows in lactation. Eight cows (453 ± 75.8 kg) yielding 14 kg milk/day were allotted to a factorial design, with two manners of cactus processing (knife-chopped or forage machine) and two diet supplies (separate concentrate or total mixed ration). Intakes of dry matter, organic matter, neutral detergent fiber and total digestible nutrients were lower when cactus was knife-chopped. Digestibility, milk production and fat and protein yield did... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Milk production and composition; Opuntia fícus indica Mill; Purine derivatives; Semi-arid; Total mixed ration. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001200027 |
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