Produção de leite de vacas alimentadas com alta proporção de forragem em dietas

Moreira, V.R.; Santos, Hélcio Silva dos; Satter, L.D.; Sampaio, Ivan Barbosa Machado

doi:10.1590/s0102-09352003000200011

Cited by 4 publications

(1 citation statement)

References 6 publications

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“…The SCC values was significant influenced (p<0.05) by the blood level, where 3/4 blood HB cows produced milk with higher SCC (585,000 SC/mL) compared to other blood levels, which showed no significant difference (p>0.05) from one another. The mean SCC value of 229,000 SC/mL and maximum value of 585,000 SC/mL reported in this study were similar to SCC values found by Moreira et al (2003), of 289,000 SC/mL and 465,000 SC/mL when compared to the SCC value found in the milk of dairy cows fed high forage percentages. According to Souza et al (2009), variations in SCC have been assigned to the pathogen species present in the mammary gland, and Streptococcus agalactiae is the main responsible for higher SCC in the milk of dairy cows.…”

Section: Resultssupporting

confidence: 89%

Chemical composition and somatic cells count of milk from Holstein x Braunvieh cows

Julliano¹,

Marco²,

Rafaella³

et al. 2015

Afr. J. Agric. Res.

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This study aimed to evaluate the chemical composition and somatic cells count (SCC) of milk from Holstein / Braunvieh (HB) cows of five different grade crossing (genetic groups): Seven ½ blood HB, 14 5/8 blood HB, 16 3/4 blood HB, 86 7/8 blood HB and 28 15/16 blood HB cows were used. Six samplings at seven-day intervals were performed. The quality of milk was assessed according to the fat, protein, lactose and defatted dry solids (DDE), urea and casein levels and somatic cells count. There was no significant difference (P>0.05) in fat content of milk among blood levels; however, the other nutrients in milk differed (P<0.05) among blood levels studied (lactose, DDE, protein, casein, urea). SCC was higher in milk produced by cows of 3/4 blood HB genetic composition. Variations in milk production among genetic groups were also verified, with 1/2 blood HB animals being more productive compared to other genetic compositions. Correlation of genetic composition, production volume, days in lactation, number of deliveries and SCC with the chemical components of milk was found. A positive correlation between genetic composition and DDE and negative with production volume and number of deliveries was found and the SCC value of 13.41% was above the recommended by Brazilian legislation for milk quality.

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Section: Resultssupporting

confidence: 89%

Chemical composition and somatic cells count of milk from Holstein x Braunvieh cows

Julliano¹,

Marco²,

Rafaella³

et al. 2015

Afr. J. Agric. Res.

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Breeding for Silage Quality Traits

Barrière

Guillaumie²,

Pichon³

et al. 2009

Cereals

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Establishing a Linkage between Phosphorus Forms in Dairy Diets, Feces, and Manures

2005

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Effective manure management to efficiently utilize organic wastes without causing environmental degradation requires a clear understanding of the transformation of P forms from diet to manure. Thus, the objective of this study was to establish quantitative relationships between P forms in diets, feces, and manures collected from U.S. Northeastern and Mid-Atlantic commercial dairy farms. Total P in diets ranged from 3.6 to 5.3 g kg(-1) dry matter, while the feces had higher P than diets (5.7-9.5 g kg(-1)) and manures had lower P (2.5-8.9 g kg(-1)) than feces. The farms with total dietary P of 4.8 to 5.3 g P kg(-1) had twofold higher concentrations of phytic acid (1647-2300 mg P kg(-1)) than farms with 3.6 to 4.0 g dietary P kg(-1) (844-1100 mg P kg(-1)). Much of the phytic acid in diets was converted to inorganic orthophosphate in the rumen as indicated by a reduction in phytic acid percentage from diets (32%) to feces (18%). The proportion of orthophosphate diesters (phospholipids, deoxyribonucleic acid [DNA]) was twice as high in feces (6.2-10%) as diets (2.4-5.3%) suggesting the excretion of microbial residues in feces. Phosphonates (aminoethyl phosphonates and phosphonolipids) were not seen in diets but were detected in feces and persisted in manures, which suggests a microbial origin. These organic compounds (phytic acid, phospholipids, DNA) were decomposed on storage of feces in slurry pits, increasing orthophosphate in manures by 9 to 12% of total P. These results suggest that reducing dietary P and typically storing feces in dairy farms will result in manure with similar chemical forms (primarily orthophosphate: 63-77%) that will be land applied. Thus, both the reduction of dietary P and storage of manure on farm are important for controlling solubility and bioavailability of P forms in soils and waters.

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Produção de leite de vacas alimentadas com alta proporção de forragem em dietas

Cited by 4 publications

References 6 publications

Chemical composition and somatic cells count of milk from Holstein x Braunvieh cows

Chemical composition and somatic cells count of milk from Holstein x Braunvieh cows

Breeding for Silage Quality Traits

Establishing a Linkage between Phosphorus Forms in Dairy Diets, Feces, and Manures

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