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Revista Brasileira de Zootecnia
Article . 2005
Data sources: DOAJ
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Efeito de diferentes fontes de gordura na dieta de vacas Jersey sobre o consumo, a produção e a composição do leite Effects of different dietary fat sources on intake and milk yield and composition of Jersey cows

Authors: Luciana Marta D'Almeida Duarte; Waldyr Stumpf Júnior; Vívian Fischer; Luciane Elisete Salla;

Efeito de diferentes fontes de gordura na dieta de vacas Jersey sobre o consumo, a produção e a composição do leite Effects of different dietary fat sources on intake and milk yield and composition of Jersey cows

Abstract

Com o objetivo de investigar o efeito de diferentes fontes de gordura na dieta de vacas Jersey sobre os consumos de matéria seca (CMS), fibra em detergente neutro (CFDN) e extrato etéreo (CEE), sobre a composição e a produção de leite (PL), foram utilizadas oito vacas Jersey, distribuídas em dois quadrados Latinos (4 x 4). Os tratamentos utilizados foram: C = concentrado sem gordura; SB = concentrado com sebo bovino; GP = concentrado com gordura protegida comercial (sais de cálcio + óleo de palma); e GS = concentrado com grão de soja. Não houve diferença para os CMS e CFDN. O CEE foi mais elevado nos tratamentos que incluíram gordura nas dietas. Os tratamentos GP e SB proporcionaram produção leiteira (PL) e produção leiteira corrigida a 4% de gordura (PLCG4%) semelhantes entre si (25,6 e 23,6 kg/vaca/dia) e GP foi superior aos tratamentos C e GS, que resultaram em PLCG4% de 23,4 e 22,9 kg/vaca/dia, respectivamente. A eficiência da produção de leite (PLCG4%:CMS) diferiu entre tratamentos. O tratamento GP apresentou a melhor eficiência de produção (1,50), apesar de semelhante ao tratamento C (1,38). Os teores de gordura (G), proteína total (P), caseína (C), sólidos totais (ST), sólidos totais desengordurados (STD), densidade (D) e índice crioscópico (IC) não diferiram entre os tratamentos. Os resultados indicam a viabilidade do uso de gordura nas dietas para vacas leiteiras de alta produção, observando-se aumento na produção e melhoria da eficiência de produção, sem alterações no consumo de alimentos e na composição do leite produzido.Eight high-yielding Jersey cows were randomly assigned to two 4x4 Latin squares to study the effects of different dietary fat sources on intakes of dry matter (DMI), neutral detergent fiber (NDFI), and ether extract (EEI) as well as on milk yield and composition. The following treatments were used: concentrate with no added fat (control = C); concentrate plus tallow (T); concentrate plus commercial ruminally protected fat (calcium salts + palm oil; PF); and concentrate plus whole soybean (WS). Both DMI and NDFI did not differ significantly among treatments. However, EEI was higher for cows fed diets containing the added fat sources than for those fed the C diet. Both milk yield and milk yield corrected for 4% fat (FCM) were highest on PF, intermediate on T, and lowest on C and WS diets. Cows fed PF had greater feed efficiency expressed as FCM/DMI (1.50), compared with those fed T or WS diets but it was similar to C (1.38). Contents of milk fat, crude protein, casein, total solids, solids-nonfat, density, and the cryoscopic index all were not affected by dietary treatments. It can be concluded that addition of fat sources to diets of lactating Jersey cows is recommended because improved milk yield and feed efficiency with no deleterious effects on DMI and milk composition.

Keywords

high-yielding cows, vacas alta produção, eficiência, soybean grain, tallow, SF1-1100, sebo, fat by pass, Animal culture, gordura protegida, efficiency, grão soja

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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!
0
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