Milk composition of Holstein cows: a retrospective study

Bondan, Carlos; Folchini, Jéssica Aneris; Noro, Mirela; Quadros, Daniel Lazzari; Machado, Karine Martini; González, Félix Hilario Díaz

doi:10.1590/0103-8478cr20180123

Cited by 28 publications

(30 citation statements)

References 15 publications

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“…The synthetic capacity of milk components was evaluated on yearly average by analysing the content and daily yield of milk protein and fat in relation to the nutrient intake according to the stage of lactation in dairy cows. The confirmed increase in the milk protein content during lactation is consistent with a previous study by Bondan et al (2018). The decrease in the milk yield in continuous lactation causes the protein content to remain more concentrated (Idamokoro et al 2017).…”

Section: Discussionsupporting

confidence: 91%

Evaluation of the milk urea content in relation to milk production and composition in dairy cows

2019

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The aim of this study was to evaluate the milk urea content along with the dynamics of lactation and milk components in production dependency in Holstein dairy cows. Evaluation of daily milk yield in relation to milk urea presented a positive regression dependency, which was the strongest in early lactation (r = 0.860; P < 0.001), decreasing in mid lactation (r = 0.329; P < 0.001) and late lactation (r = 0.261; P < 0.001). Evaluation of milk protein in relation to milk urea showed a negative regression dependency, which was the strongest in early lactation (r = -0.850; P < 0.001), decreasing in mid lactation (r = -0.819; P < 0.001) and late lactation (r = -0.679; P < 0.001). The somatic cell counts in relation to milk urea confirmed a negative regression dependency in early lactation (r = -0.635; P < 0.05) and mid lactation (r = -0.818; P < 0.05), but no significance was found in late lactation. The results of the study confirm the influence of production factors (milk quantity and milk components) on the milk urea content. Dependencies found between the production, milk components and milk urea are applicable for the evaluation of protein nutrition and metabolic transformation of nutrients in dairy cows.

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Section: Discussionsupporting

confidence: 91%

Evaluation of the milk urea content in relation to milk production and composition in dairy cows

2019

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“…In our study, the SCC of rabbit milk was slightly correlated with casein but not with any of the other analyzed chemical compounds. The researchers Bondan et al [60] analyzed the relationship between the milk yield of Holstein cows and the chemical composition of their milk. The values of correlation coefficients were low to medium degree.…”

Section: Discussionmentioning

confidence: 99%

Hycole Doe Milk Properties and Kit Growth

Ludwiczak

Składanowska-Baryza

Kuczyńska

et al. 2020

Animals

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The level of production and the physiochemical traits of rabbit milk affect the growth and the mortality of bunnies during lactation. The goal of the study was to analyze the effect of litter size and day of lactation on the quality traits of rabbit milk, milk production, and associative traits. The study was conducted on 32 Hycole does and their litters. The rabbit milk pH ranged from 6.61 to 7.46. The colostrum was characterized by the highest content of total solids (31.54 and 31.80 g kg−1) and fat content (15.73 and 15.9 g kg−1). The milk from the beginning of the lactation was characterized by the highest level of somatic cell count (SCC) (523.67 and 536.57 103 mL−1), which gradually decreased to reach the lowest level on days 17 and 21 of lactation. The daily milk production was greater for does nursing 10 kits per litter compared to those nursing eight kits per litter (p < 0.001). The peak of milk production occurred on day 17 postpartum. To conclude, the litter size has a clear effect on milk production as well as litter weight and litter weight gains. It is also important to note that the day of lactation affected the physiochemical traits of rabbit milk.

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“…Lower levels of production were found for Holstein cows raised in other Brazilian regions. In the southern region, for instance, Silva et al (2011), Ludovico et al (2015) and Bondan et al (2018) found an average production of 28.62, 31.78 and 25.50 kg/cow/day, respectively. In the southeast region, Bignardi et al (2015) and Villadiego et al (2016) recorded an average value of 24.25 and 22.9 kg/cow/day, respectively.…”

Section: Resultsmentioning

confidence: 97%