Utilização de óleo de soja em rações para vacas leiteiras no período de transição: consumo, produção e composição do leite

Torres, Ciro Alexandre Alves; Rennó, Francisco Palma; Drumond, Mariana Resende Soares; Júnior, José Esler de Freitas

doi:10.1590/s1516-35982009000700028

Cited by 9 publications

(5 citation statements)

References 21 publications

(16 reference statements)

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“…Similar to our findings, but with Jersey cows, Botaro et al (2011), in a study in the state of São Paulo from 2007 to 2008 found higher fat contents in the milk from Jersey cows (3.97%) compared to Holstein and Girolando cows, which showed no significant difference from each other (3.54 and 3.45%, respectively). The result of this study in relation to the fat percentage of milk from Holstein cows (2.93%) was lower than that found by Santos et al (2009), who observed high fat content in the milk from Holstein cows (4.30%) using soybean oil in the diets of cows during the transition period. Paula et al (2008) and Stelzer et al (2009) observed similar fat contents (3.40%), but higher than those found in this work.…”

Section: Resultscontrasting

confidence: 88%

Chemical profile, somatic cell count and milk production of Holstein, Girolando and Jersolando cows

Brasil¹,

Silva²,

Carvalho³

et al. 2015

Afr. J. Agric. Res.

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The aim of this study was to evaluate the chemical profile, somatic cell count (SCC) and milk production of Holstein, Girolando and Jersolando cows. Fresh milk samples were collected from 34 high-production cows, averaging 31 L/day, belonging to three genetic groups (Holstein, Girolando and Jersolando). Experimental design was completely randomized, in which data collected were submitted to analysis of variance considering the effects of genetic group on milk quality and production. Correlations between milk volume and fat, protein, lactose, total dry extract, defatted dry extract and SCC were assessed. Jersolando herd produced milk with higher content of solids compared to the Holstein and Girolando. In relation to milk production, Girolando cows stood out over the others. Correlations between volume and fat, protein, total dry extract and defatted dry extract were negative; however, lactose showed positive correlation. The dairy system evaluated in this study demonstrated potential to meet the quality requirements of milk related to SCC in the current period and also from 2014, showing that large investments in facilities are not required to obtain quality milk.

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Section: Resultscontrasting

confidence: 88%

Chemical profile, somatic cell count and milk production of Holstein, Girolando and Jersolando cows

Brasil¹,

Silva²,

Carvalho³

et al. 2015

Afr. J. Agric. Res.

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“…Staples et al (2001) cited that the productive answer to the utilization of supplemental dietary fat for lactating cows can result in increases in milk yield from 2.0 to 2.5 kg/cow/day. Santos et al (2009) evaluated the inclusion of 3.30% soybean oil, in total dry matter basis, in the diet of dairy cows in the transition period and early lactation. The authors observed that the animals fed soybean oil diet produced 2.53 kg/d more milk than those fed control diet (7.93%).…”

Section: Introductionmentioning

confidence: 99%

Productive performance and composition of milk protein fraction in dairy cows supplemented with fat sources

et al. 2010

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-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. Dry matter and nutrient intakes were lower when cows received the diet containing calcium salts of fatty acids, in relation to the control diet. Among the diets with fat sources, the one with whole raw soybean and calcium salts decreased milk production. There was no effect of fat sources added to the diet on crude protein, non-protein nitrogen, non-casein nitrogen, true protein, casein, casein/milk true protein ratio and serum protein. Similarly, the experimental diets did not influence the protein fractions when expressed in percentage of milk crude protein. The utilization of fat sources in diets changes milk production and composition of lactating cows, but does not influence the composition of milk protein fractions.Key Words: fat supplementation, intake, milk production and composition, non-protein nitrogen, true proteinDesempenho produtivo e composição da fração proteica do leite de vacas leiteiras sob suplementação com fontes de gordura RESUMO -Objetivou-se com este estudo avaliar a utilização de fontes de gordura em rações para vacas em lactação sobre o desempenho produtivo e a composição da fração proteica do leite. Foram utilizadas 12 vacas da raça Holandesa, agrupadas em três quadrados latinos balanceados 4 × 4, alimentadas com as seguintes rações: controle; óleo de soja refinado; grão de soja in natura; e sais de cálcio de ácidos graxos insaturados (Megalac-E). Avaliaram-se o consumo de matéria seca e de nutrientes, e a produção diária de leite. As amostras utilizadas para análise da composição do leite foram coletadas em dois dias alternados e foram provenientes das duas ordenhas diárias. Foram analisados a composição do leite e os teores de nitrogênio total, nitrogênio não-proteico e nitrogênio não-caseinoso. Por diferença, foram obtidos os teores de caseína, proteína do soro e proteína verdadeira. O consumo de matéria seca e de nutrientes foi menor quando as vacas receberam a ração contendo sais de cálcio de ácidos graxos em relação à ração controle. Entre as rações com fontes de gordura, aquela com grão de soja e sais de cálcio diminuiu a produção de leite. Não houve efeito das fontes de gordura adicionadas nas rações sobre os teores de proteína bruta, nitrogênio não-proteico, nitrogênio não-caseinoso, proteína verdadeira, caseína, r...

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“…In evaluating DMI (g/kg 0.75 ) had significant effect (P <0.05) of breed and treatment with advancing pregnancy. Morada Nova ewes exhibited a lower consumption according to Santos et al (2009) reporting that near parturition, there was a decrease without any metabolic disorder has been confirmed. This fact emphasizes the adaptive capacity of these animals with little decrease in the DMI, once that the low offer of energy derived from the diet associated with a decrease in nutrient intake could promote serious metabolic disorders.…”

Section: Resultsmentioning

confidence: 88%

Intake and some indicators of the metabolic status of native ewes in pregnancy and supplemented in grazing system

Tairon¹,

Carlo²,

Jacira³

et al. 2015

Afr. J. Agric. Res.

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The present study was to evaluate the effect of level of concentrate supplementation on the intake and some indicators of the metabolic parameters of native ewes in pregnancy and supplemented in a grazing system. 28 lactating ewes were selected: 14 Morada Nova (MN) and 14 Santa Inês (SI) were distributed in an experimental design completely randomized in 2x2x3 factorial arrangement with two breeds (MN and SI), two levels of supplementation (0.5 and 1.5% body weight) and three experimental periods (75, 105 and 135 days of pregnancy). The concentrate intake and total dry matter intake (DMI) was higher (P <0.05) on SI ewes and, in animals supplemented with 1.5% of concentrate, where the pregnancy progresses promoted the progressive decrease of DMI. There was breed effect (P <0.05) on metabolic parameters evaluated, in which the two breeds presented the same trend of mobilization of body reserves with decrease (P <0.05) in the body condition score close of parturition. Supplementation did not influence in the metabolic parameters. The metabolic parameters were influenced by breed, however, with normal values, indicating a good adaptability of the MN and SI breeds at the experimental conditions, promoting an evolution of production rates with 0.5% of concentrate supplementation.

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Utilização de óleo de soja em rações para vacas leiteiras no período de transição: consumo, produção e composição do leite

Cited by 9 publications

References 21 publications

Chemical profile, somatic cell count and milk production of Holstein, Girolando and Jersolando cows

Chemical profile, somatic cell count and milk production of Holstein, Girolando and Jersolando cows

Productive performance and composition of milk protein fraction in dairy cows supplemented with fat sources

Intake and some indicators of the metabolic status of native ewes in pregnancy and supplemented in grazing system

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