Analysis of Non-Genetic Factors Affecting Wood’s Model of Daily Milk Fat Percentage of Holstein Cattle

Zhou, Fu-zhen; Liang, Yan; Arbab, Abdelaziz Adam Idriss; Li, Mingxun; Yang, Zhangping; Karrow, Niel A.; Mao, Yongjiang

doi:10.3390/vetsci9040188

Cited by 3 publications

(2 citation statements)

References 42 publications

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“…Researchers revealed the influence of certain non-genetic factors on the parameters of the lactation curve for milk yield (Tekerli et al, 2000) and its composition (Zhou et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

Characteristics of Lactation Curve and Reproduction in Dairy Cattle

Ruban¹,

Danshyn²,

Matvieiev³

et al. 2023

Acta Univ. Agric. Silvic. Mendelianae Brun.

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The purpose of the research was to assess changes in the lactation activity of cows and their impact on the level of reproduction, as well as to study their fluctuations with respect to genetic and environmental factors. A sample of 807 cows of various ages was formed for the study. The cows were kept on a commercial farm in Kharkiv region, Ukraine. Data from DairyPlan C21 software were used in the study. It was revealed that the parameters of the Wood lactation curve model were significantly influenced by the calving season, days open, and cow's origin; lactation persistency of cows was more influenced by environmental factors (parity, calving season, days open) than by the sire. In order to improve the level of reproduction in dairy herds, it is advisable to take into account the lactation persistency of cows, since it has negative relationship with days open (r = -0.074). To improve lactation persistency it is necessary to use for insemination of cows semen of sires with high breeding values for this trait.

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“…Researchers revealed the influence of certain non-genetic factors on the parameters of the lactation curve for milk yield (Tekerli et al, 2000) and its composition (Zhou et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

Characteristics of Lactation Curve and Reproduction in Dairy Cattle

Ruban¹,

Danshyn²,

Matvieiev³

et al. 2023

Acta Univ. Agric. Silvic. Mendelianae Brun.

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show abstract

“…Dairy cows are divided into different groups on dairy farms. The typical formula for early lactation cows with a 30 kg daily milk yield is shown in Table 1 [ 32 ]. Mixed milk samples were taken from the tested cattle, and 40 mL milk samples were taken from each cow.…”

Section: Methodsmentioning

confidence: 99%

Polymorphisms of the IL-17A Gene Influence Milk Production Traits and Somatic Cell Score in Chinese Holstein Cows

Mohyuddin

Liang

et al. 2022

Bioengineering

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The cow’s milk production characteristics are a significant economic indicator in the livestock industry. Serum cytokines such as interleukin-17 (IL-17) may be potential indicators for bovine mastitis concerning the milk somatic cell count (SCC) and somatic cell score (SCS). The current study aims to find previously undiscovered single nucleotide polymorphisms in the bovine (IL-17A) gene and further investigates their associations with milk production traits in Chinese Holstein cows. Twenty Chinese Holstein cows were randomly chosen from six farms in Jiangsu Province, China. The DNA was extracted from selected samples of bloods for PCR amplification Sequence analyses were used to find SNPs in the bovine (IL-17A) gene. The discovered five SNPs are g-1578A>G, g-1835G>A, and g-398T>A in the 5′UTR; g3164T>C and g3409G>C in the exon region. The genotyping of Holstein cows (n = 992) was performed based on Sequenom Mass ARRAY and SNP data. The connection between SNPs, milk production variables, and the somatic cell score was investigated using the least-squares method. Based on the results, SNP g-398T>A had a significant linkage disequilibrium with g3164T>C. SNPs were found to have significant (p < 0.05) correlations with the test-day milk yield. In conclusion, IL-17A affects cow’s milk production traits significantly.

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Influence of Lactation Number, Year and Season of Calving on Milk Productivity of Cows

KRAMARENKO¹,

Крамаренко²

2022

UBSRAS

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The main characteristics of the milk productivity of Holstein dairy cattle differ in different countries due to differences in terrain, management and breeding objectives. At the same time, the manifestation of non-genetic (that is, environmental) factors during milk production, as a rule, mask the real breeding value of animals. The main goal of this study was to analyze the influence of lactation number, year and season of calving on the milk productivity of 238 Holstein cows during a 4-year period (2014-2017). The study was conducted using primary data on the dairy productivity of livestock in the conditions of PJSC Plemzavod Stepnoi of the Kamian-Dnipro district of the Zaporizhia region.The following characteristics were evaluated for each animal: duration of lactation, hope for 305 days of lactation, hope for the entire lactation, fat content and protein content in milk. P. Wood's model was used to approximate lactation curves within each subgroup. All signs of milk productivity were analyzed based on the algorithm of one- or two-factor analysis of variance with fixed factors using the statistical package STATISTICA v. 6.0 (Statsoft Inc.).Lactation number was found to have a significant effect on all milk yield traits that were examined (in all cases: p<0.001). Hope for 305 days of lactation increased with the growth of lactation number. The highest values of this characteristic were noted during the 2nd and 3rd lactations. The lowest estimate of milk yield for 305 days of lactation of dairy cows of this farm was obtained in 2014, and the highest in 2016. The calving season probably influenced the indicators of milk productivity (primarily, the content of fat and protein in milk) of firstborns. In addition, the milk yield score at 305 days of lactation was lower among winter- or spring-calved gilts compared to fall-calved animals. No influence of the calving season was noted among adult cows. Lactation number and year of calving probably influenced the estimates of the coefficients and parameters of P. Wood's model. The shape of the lactation curves of firstborns was flatter compared to mature cows. Estimates of peak milk yield were lower, but the index of constancy of the lactation curve was higher during the 1st lactation. Thus, we found that obtaining real (unbiased) estimates of milk productivity traits of Holstein cattle requires preliminary adjustment of data regarding the influence of lactation number, year and season of calving

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Analysis of Non-Genetic Factors Affecting Wood’s Model of Daily Milk Fat Percentage of Holstein Cattle

Cited by 3 publications

References 42 publications

Characteristics of Lactation Curve and Reproduction in Dairy Cattle

Characteristics of Lactation Curve and Reproduction in Dairy Cattle

Polymorphisms of the IL-17A Gene Influence Milk Production Traits and Somatic Cell Score in Chinese Holstein Cows

Influence of Lactation Number, Year and Season of Calving on Milk Productivity of Cows

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