Nutritional Influences on the Composition of Milk from Cows of Different Protein Phenotypes in New Zealand

Mackle, T.R.; Bryant, A. M.; Petch, S. F.; Hill, J. P.; Auldist, M.J.

doi:10.3168/jds.s0022-0302(99)75221-5

Cited by 67 publications

(53 citation statements)

References 25 publications

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“…Despite large differences in total milk protein concentrations and differences in relative casein concentrations over the course of the experimental period, the pattern of individual milk protein curves was for the most part similar over the first 155 days of lactation in HP-and LP-cows, suggesting comparable adaptation as well as strong genetic effects. Consistent with previous results, relative concentrations of α-and β-CN accounted for approximately one third each and of κ-CN roughly for one sixth of all proteins in both groups (Mackle et al, 1999;Bobe et al, 2007). In the less milk-producing HP-cows, relative concentrations of α-and β-CN were lower over the course of the experimental period: this is not seen in cows differing in genetic merit for milk production (Bobe et al, 2007).…”

Section: Discussionsupporting

confidence: 78%

Composition of major proteins in cow milk differing in mean protein concentration during the first 155 days of lactation and the influence of season as well as short-term restricted feeding in early and mid-lactation

Gellrich¹,

Meyer²,

Wiedemann³

2014

CZECH J ANIM SCI

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A variety of proteins contributes greatly to the unique nutritional and functional quality of dairy cow milk. Particularly, milk casein content and composition have substantial influence on the processing capabilities. In the present study, milk of 23 multiparous Holstein-Friesian cows, grouped as high-(3.49 ± 0.05%; n = 11) and low-protein (3.03 ± 0.05%; n = 12) cows, was sampled approximately weekly during the first 155 days of lactation to determine the course of relative milk protein composition (α-lactalbumin; β-lactoglobulin; α-, β-, and κ-casein). Furthermore, feed restrictions by 30% of dry matter intake in early and mid-lactation as well as experimental tissue biopsies were conducted to observe their effect on milk protein composition. Milk protein composition was relatively stable and displayed similar concentration patterns throughout the experimental period between both groups. Mean relative concentrations of α-, β-, κ-casein, α-lactalbumin, and β-lactoglobulin were 34.2, 31.4, 16.0, 2.1, and 9.7% of total protein, respectively. Feed restrictions did not alter milk protein composition, whereas the season influenced α-and β-casein as well as α-lactalbumin. Further, effects were observed in both groups at times of unfamiliar stressful situations caused by taking liver or muscle biopsies. As a result, the relative concentration of β-casein increased. Therefore, acute stress factors may lead to a deviation in milk protein composition and should be avoided.

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Section: Discussionsupporting

confidence: 78%

Composition of major proteins in cow milk differing in mean protein concentration during the first 155 days of lactation and the influence of season as well as short-term restricted feeding in early and mid-lactation

Gellrich¹,

Meyer²,

Wiedemann³

2014

CZECH J ANIM SCI

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“…(Pulina et al, 1993) and other Mediterranean dairy sheep breeds (Cavani et al, 1991;Fuertes et al, 1998). BLG and ALA concentrations agree with previous results in dairy sheep (Duranti and Casoli, 1991;Law, 1995) but are higher than those reported for goats (Law, 1995) and cows (Law, 1995;Mackle et al, 1999). As cow milk is the major industrial source of serum proteins, this result is particularly interesting because sheep milk may be a new and more profitable source of whey protein.…”

Section: Discussionsupporting

confidence: 77%

Effects of lactation stage, parity, β-lactoglobulin genotype and milk SCC on whey protein composition in Sarda dairy ewes

Nudda

Feligini

Battacone

et al. 2003

Italian Journal of Animal Science

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In 90 Sarda dairy ewes the effects of lactation stage, parity, β-lactoglobulin genotypes, and somatic cell count (SCC) on the milk content of total protein (TP), casein (CN), whey protein (WP) and its fractions α-lactalbumin (ALA), β-lactoglobulin (BLG), serum albumin (SA), immunoglobulin (IG) and lactoferrin (LF) were analysed using a linear mixed model. Mean values of variables (g/l) were: TP (54.0), CN (43.0), WP (11.0), BLG (4.78), ALA (1.37), SA (0.61), IG (3.83) and LF (0.28). The lactation stage significantly affected all the variables analysed. TP, CN and WP concentrations tended to increase throughout lactation, with the increase of WP being more pronounced than the corresponding variation in CN. There was no definite trend in BLG content, whereas ALA concentration decreased as lactation progressed. The parity affected almost all variables studied. WP concentration differed significantly only between the second and fourth parity (10.45 vs 11.44 g/l). BLG and SA concentrations were significantly lower in the youngest ewes. The BLG genotype affected milk yield, but no effects were observed on the components of the milk. The SCC influenced almost all variables studied. The TP concentration was significantly higher in milk with SCC >1,000,000 (55.0 g/l) than in milk with lower SCC (53.4 g/l). This was mainly due to the increase of WP (12.52 and 10.24 g/l in milk with SCC above and below 1,000,000/ml respectively), especially in those WP fractions originating from blood. TP (54,0), CN (43,0), WP (11,0), BLG (4,8), ALA (1,4), SA (0,61), IG (3,83) e LF (0,28

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“…O animal metabolizaria uma maior proporção de aminoácidos glicogênicos, no fígado, para a síntese de glicose, quando se encontra em restrição alimentar, em decorrência, principalmente, da restrição de suprimento de propionato (Mackle et al, 1999). Fredeen (1996) demonstram que a substituição de silagem de milho por pastagem de boa qualidade leva ao aumento na produção de proteína, pela maior digestibilidade da dieta e maior suporte de nutrientes.…”

Section: Resultsunclassified

“…Mackle et al (1999) encontraram maiores valores para caseína em pastagem de verão e utilização de concentrado, e a concentração de caseína declinou quando houve restrição de pasto. Na região sul do Rio Grande do Sul, em propriedades que utilizam leguminosas consorciadas com gramíneas de inverno, observa-se o seu maior vigor no período inicial de primavera.…”

Section: Resultsunclassified

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Avaliação da qualidade do leite na bacia leiteira de Pelotas, RS. Efeito dos meses do ano

et al. 2004

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RESUMO -Os efeitos dos meses do ano sobre a composição e produção do leite foram avaliados através do acompanhamento de 10 unidades produtoras de leite, divididas em três sistemas de produção classificados como especializado (ES), semi-especializado (SE) e não-especializado (NE), durante 11 meses do ano. Foram coletadas amostras de leite diretamente dos tanques refrigeradores para determinação das características físico-químicas e contagem de células somáticas (CCS). Quantificaram-se a incidência de mastite e a produção média de leite (litros/vaca/dia) e coletaram-se amostras de água utilizada para consumo e limpeza, de pastagem, concentrado e silagem. O delineamento adotado foi o completamente casualizado, em arranjo fatorial desbalanceado, considerando como fatores os meses do ano, os sistemas de produção e a sua interação. Não foi encontrada variação significativa entre os meses estudados para produção de leite, valores de crioscopia, porcentagens de gordura, extrato seco, nitrogênio não-protéico, CCS, composição química, contagem de coliformes da água e composição bromatológica do concentrado. Os maiores valores de proteína verdadeira do leite foram observados em outubro e novembro, enquanto os maiores de caseína, em outubro, novembro, março e abril. O extrato seco desengordurado foi superior em dezembro e a acidez variou juntamente com a incidência de mastite, sendo superior nos meses de novembro e maio. Em relação à proteína bruta, ocorreu interação entre meses e sistemas. Foram observadas correlações negativas entre produção de leite e gordura, mastite e CCS, e correlação positiva entre produção de leite e lactose. O leite produzido nos diversos meses do ano diferiu, principalmente, quanto à incidência de mastite, fração protéica, extrato seco desengordurado e acidez. A qualidade da água não se modificou expressivamente nos meses em que foi amostrada e se apresentou dentro dos limites considerados aceitáveis.Palavras-chave: característica físico-química do leite, contagem de células somáticas, mastite, produção de leite, variação sazonal Evaluation of Milk Quality on Different Months of Year at Pelotas Dairy Basin, RSABSTRACT -The effect of months of year upon milk production and quality was estimated through evaluation of ten dairy production units classified as specialized (S), partially specialized (PS) and not specialized (NS), which were visited on 11 months of the year. Bulk tank milk was sampled to determinate physical and chemical characteristics and somatic cell count (SCC), mastitis percentage and milk production (liters/cow/day). Besides that, samples of feeds and water used for drinking and cleaning were collected. There were not significant differences between months for milk production, crioscopy, percentages of fat, total solids, non protein nitrogen and SCC, but true protein percentages were higher on October and November, and casein showed higher values on October, November, March and April. Total solids were higher on December. Acidity varied in same way as mastitis percentage, higher on...

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Nutritional Influences on the Composition of Milk from Cows of Different Protein Phenotypes in New Zealand

Cited by 67 publications

References 25 publications

Composition of major proteins in cow milk differing in mean protein concentration during the first 155 days of lactation and the influence of season as well as short-term restricted feeding in early and mid-lactation

Composition of major proteins in cow milk differing in mean protein concentration during the first 155 days of lactation and the influence of season as well as short-term restricted feeding in early and mid-lactation

Effects of lactation stage, parity, β-lactoglobulin genotype and milk SCC on whey protein composition in Sarda dairy ewes

Avaliação da qualidade do leite na bacia leiteira de Pelotas, RS. Efeito dos meses do ano

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