scholarly journals A Candidate Gene Association Study for Economically Important Traits in Czech Dairy Goat Breeds

Animals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1796
Author(s):  
Michaela Brzáková ◽  
Jana Rychtářová ◽  
Jindřich Čítek ◽  
Zuzana Sztankóová
Keyword(s):  
Environmental Factors ◽  
Somatic Cell ◽  
Milk Yield ◽  
Mixed Model ◽  
Linear Mixed Model ◽  
Animal Health ◽  
Dairy Goat ◽  
Fat Percentage ◽  
Daily Milk Yield ◽  
Daily Milk

Milk production is influenced by many factors, including genetic and environmental factors and their interactions. Animal health, especially udder health, is usually evaluated by the number of somatic cells. The present study described the effect of polymorphisms in the ACACA, BTN1A1, LPL, and SCD genes on the daily milk yield, fat, and protein percentages and somatic cell count. In this study, 590 White Shorthaired (WSH) and Brown Shorthaired (BSH) goats were included. SNP genotyping was performed by PCR-RFLP and multiplex PCR followed by SNaPshot minisequencing analysis. The linear mixed model with repeated measurement was used to identify the genetic associations between the studied genes/SNPs and chosen traits. All selected genes were polymorphic in the tested goat populations and showed significant associations with milk traits. Only BTN1A1 (SNP g.599 A > G) showed a significant association with the somatic cell score. After Bonferroni correction, a significant effect of LPL g.300G > A on daily milk yield and fat percentage, LPL g.185G > T on protein percentage, and LPL G50C, SCD EX3_15G > A, and SCD EX3_68A > G on fat percentage was found. The importance of environmental factors, such as the herd-year effect, month of milking, and lactation order on all milk performance indicators was confirmed.

scholarly journals DAY-TO-DAY VARIATIONS IN FAT PERCENT OF COW'S MILK

1990 ◽  
Vol 70 (2) ◽  
pp. 731-734 ◽  
Author(s):  
A. S. ATWAL ◽  
J. D. ERFLE
Keyword(s):  
Dairy Cows ◽  
Key Words ◽  
Milk Yield ◽  
Milk Fat ◽  
Rumen Fluid ◽  
Supplemental Feeding ◽  
Fat Percentage ◽  
Milk Fat Depression ◽  
Daily Milk Yield ◽  
Daily Milk

Large day-to-day variations in milk fat, particularly for the morning milkings, were observed in 36 Holstein cows. Changes in percent fat were gradual and produced wavelike patterns in a number of instances. Supplemental feeding of long hay had no effect on acetate/propionate ratio in rumen fluid, daily milk yield or weighted milk fat percentage. Key words: Dairy cows, milk, fat depression, hay

Assessment of the Canadian model predicting daily milk yield and milk fat percentage using single-milking dairy herd improvement samples

2019 ◽  
Vol 99 (3) ◽  
pp. 521-531
Author(s):  
M. Duplessis ◽  
R. Lacroix ◽  
L. Fadul-Pacheco ◽  
D.M. Lefebvre ◽  
D. Pellerin
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Dairy Herd ◽  
Fat Percentage ◽  
Daily Milk Yield ◽  
Daily Milk

scholarly journals THE INFLUENCE OF SIRES ON MILK YIELDS AND ITS QUALITY IN STALL HOUSING OF COW

2020 ◽  
Vol 59 ◽  
pp. 97-104
Author(s):  
I. D. Filipenko
Keyword(s):  
Somatic Cell ◽  
Cell Count ◽  
Milk Yield ◽  
Analysis Of Variance ◽  
Somatic Cell Count ◽  
State Farm ◽  
The Difference ◽  
Daily Milk Yield ◽  
Physical And Chemical ◽  
Daily Milk

The results of the research on the influence of genetic factors on milk productivity and quality composition of milk in the cows at the state farm “Hontarivka” of the Institute of Animal Science, NAAS, Kharkiv region have been given in the article. According to the analysis of variance the factor “line” significantly influenced all indicators of daily milk yields (р < 0,001). However, the degree of the influence of this factor was not high. The factor “line” had the greatest effect on the content of protein in milk – 2.41% and it had the least influence on the somatic cell count in milk. When studying the average physical and chemical values of milk, it was found that the highest average daily milk yield was in the cows of the Hanover line (20.4 kg) and the lowest – in the cows of the Cavaler and Chiff lines (19.6 kg). The cows of Bella line had the best performance as for the content of fat in milk – 4.31%, while the percentage of fat in the milk of Chiff line cows was only 3.98%. The cows of Elevation line had the maximum protein content in milk (3.28%), while the cows of Hanover line had a minimum content of protein in milk – 2.96%. The milk of the animals differed by the somatic cell count, the average content of which varied from 314 000/ cm3 in the milk of cows of the Bell line to 530 000/ cm3 in the animals of the Hanover line. Negative values of the coefficients of the correlation of daily milk yields with the content of fat (–0.225), protein (–0.305), the somatic cell count in milk (–0.134) were obtained. The positive relationship was revealed between the content of fat and protein in milk (+0.282). The low positive connection was also detected between the somatic cell count and the content of protein (+0.061) and the connection with the percentage of fat in milk was lower (+0.021). The revealed dependencies have indicated that the selection aimed at the increase in milk yield should take into consideration the content of fat and protein in milk. However, it does not exert a negative influence on such an indicator of milk quality as the somatic cell count. By the results of the analysis of variance, it has been found that the factor “sire’ significantly influenced the daily milk yield, the content of fat and protein, the number of somatic cells in the milk of their daughters (р < 0.001). Due to the effect of this factor on the daily milk yields the following results were obtained: milk yield – 2.11%, content of fat – 4.21%, the content of protein – 8.2%, somatic cell count – 1.14%. When comparing the average values of the parameters under investigation it has been found that the daily milk yields of some bulls ‘daughters varied from 18.9 kg to 21.2 kg of milk. The daughters of the bull K. Stallion 50750432 were the most productive by the milk yields (p < 0.001), they exceeded by 6.5 – 12.2% the daughters of the bull Chapman 0347903595, Eldorado 579136891, Dante 580024972 and Besson 393035302. As for the content of fat in milk the differences between the best and the worst parameters of the daughters of the bulls under investigation were 0.39%. In this case, the daughters of the sire Benjamin 7866444 significantly exceeded (p < 0.001) the daughters of the sires Besson 393035302 and Eldorado 579136891 by the above parameter. The daughters of the bulls B. R. Harmoni 9498163 and Prento 1402472395 were the best by the content of protein.in milk, they exceeded the daughters of the bulls Belissar 365235897 and Chapman 0347903595 by 0.27–0.35% (р < 0,001). The milk of the daughters of the above bulls was different by the somatic cell count. The average value of this parameter varied from 288 000/ cm3 in the milk of the daughters of Chapman 0347903595 to 530 000/ cm3 in the daughters of Belissar 365235897. The difference between all minimum and maximum average parameters was highly probable (P < 0.001). If we consider the number of cases of diagnosis of mastitis in the daughters of different bulls, then it was proportional to the average values of the somatic cell count in the milk. The incidence of mastitis among the cows ranged from 11.6 ± 2.71% in the daughters of the bull Chapman 0347903595 to 22 ± 4.16% in the daughters of Belissar 365235897. It should be noted that in accordance with the above data the difference between the parameters of the physical and chemical properties of milk and the incidence of mastitis obtained in the cows of different lines was less than that in the daughters of different sires. Therefore, it is advisable to make the assessment and selection by some sires rather than by their lineage.

scholarly journals Complete rations containing coarsely chopped or ground hay for dairy cows in confinement vs. conventional grazing

1969 ◽  
Vol 75 (3) ◽  
pp. 241-251
Author(s):  
Paul F. Randel
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Net Energy ◽  
Fat Percentage ◽  
Period 2 ◽  
Randomized Design ◽  
Wheat Middlings ◽  
Completely Randomized Design ◽  
Daily Milk Yield ◽  
Daily Milk

Treatments A and B, based on complete rations, and a conventional control (C) were compared in a completely randomized design including 8 preliminary days and 3 successive 28-day comparison periods with 17 cows (13 Holstein and 4 Brown Swiss). Both complete rations incorporated 60% basal concentrates, principally ground maize, soybean meal, wheat middlings and cane molasses, and 40% grass hay, but differed in the coarsely chopped hay in A and ground hay (9.5 mm screen) ¡n B. Formulation specified 13% crude protein and 1.58 Mcal of net energy for lactation/kg of dry matter (DM). Each was fed to two groups of three cows, ad libitum in period 1 and restricted in periods 2 and 3 in late afternoon. During the hottest hours these animals rested under shade, which reduced thermal stress. Five control cows grazed rotationally at 2.5 animals/ha in gramineous swards of good quality, with individual supplementation of basal concentrates according to milk yield. Late in period 1, DM intake (DMI) of A and B reached maxima of 22 and 23 kg per per. Mean results for A, B and C, respectively, during 84 days were: daily DMI, 16.2, 16,4 and 6.0 kg (excluding pasture herbage), and as a percentage liveweight (LW), 2.96, 2.98 and 1.09; LW, 548, 552 and 550 kg; daily milk yield, 17.7, 16.5 and 16.0 kg; 4% fat corrected milk (FCM), 15.0, 13.7 and 14.0 kg; milk fat percentage, 3.00, 2.87 and 3.19; FCM/concentrates DMI ratio, 1.55, 1.39 and 2.34. One cow of B died of acute bloat in period 2, possibly because of insufficiency of effective fiber in the rumen. Complete ration A appears promising as a possible alternative for intensified dairying in Puerto Rico.

ADRENALECTOMY IN THE GOAT REPLACEMENT THERAPY AND THE MAINTENANCE OF LACTATION

1958 ◽  
Vol 16 (4) ◽  
pp. 403-414 ◽  
Author(s):  
A. T. COWIE ◽  
J. S. TINDAL
Keyword(s):  
Replacement Therapy ◽  
Milk Yield ◽  
Milk Fat ◽  
Adrenal Steroids ◽  
Milk Secretion ◽  
Fat Percentage ◽  
Lactating Goats ◽  
The Mean ◽  
Daily Milk Yield ◽  
Daily Milk

SUMMARY The mean survival period of twelve goats after adrenalectomy was 7·8±1·2 days. Adrenalectomy resulted in a progressive rise in the concentration of K and a fall of Na in the plasma. In the lactating goat there was a rapid inhibition of milk secretion and the concentration of K in the milk fell, while that of Na rose slightly as the yield dropped. Partial to complete maintenance of lactation was achieved in five lactating goats after adrenalectomy by implanting tablets of cortisone (or cortisone acetate) and deoxycorticosterone acetate (DCA), a daily absorption of at least 6–12 mg cortisone (or its acetate) and 2·5 mg DCA being required. DCA was the more critical component of the combination. During replacement therapy, when the daily milk yield had become relatively steady, the composition of the milk (fat and solids-not-fat percentages) and the Na and K concentrations in the milk were within the pre-operative ranges, but during the periods of adrenal insufficiency, when the milk yield declined, there was a concomitant rise in milk-fat percentage and a fall in milk K. These changes, however, also occurred when the milk yields fell from other causes and so they may not be directly attributable to the lack of adrenal steroids.

scholarly journals Determination of a possible relationship between a single nucleotide polymorphism (SNP) in the promoter region of the <i>SIRT1</i> gene and production and reproduction traits in the Agerolese cattle breed

2019 ◽  
Vol 62 (1) ◽  
pp. 107-112 ◽  
Author(s):  
Maria Selvaggi ◽  
Claudia Carbonara ◽  
Francesca Ciotola ◽  
Sara Albarella ◽  
Giulio Aiudi ◽  
...  
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Promoter Region ◽  
Class Iii ◽  
Fat Percentage ◽  
Single Nucleotide ◽  
Genotype Frequencies ◽  
Reproduction Traits ◽  
Daily Milk Yield ◽  
Daily Milk

Abstract. Sirtuins (sir2-like proteins) belong to the family of class III NAD+-dependent histone deacetylases. Among them, SIRT1 is the most studied sirtuin. It plays a key role in many biological processes in the liver, adipose tissue, muscle, pancreas, testis, ovary and mammary gland. It has an important function in endocrine signaling, with a specific role in glucose and fat metabolism. To date, in bovine species, only few SIRT1 single nucleotide polymorphisms (SNPs) have been reported in the literature. Thus, the aims of the present study were to estimate the allele and genotype frequencies at the g.-274C > G locus in the promoter region of the SIRT1 gene and to investigate, for the first time, the relationship among different genotypes and milk production and some reproduction traits in a sample of cows belonging to the Agerolese breed. All the animals were genotyped at the abovementioned locus using the PCR-RFLP technique. The investigated population was found to be polymorphic at the investigated locus. Concerning milk production performances, significant differences between genotypes were found in daily milk yield (DMY), fat percentage (FC), lactation length (LL), peak daily milk yield (PY) and 305-day milk yield (305MY). Moreover, the effect of the g.-274C > G genotype on age at first calving and calving period was significant. In conclusion, our findings are promising and should encourage scientists to further investigate the effect of genetic polymorphism of sirtuins on milk performance and reproductive traits.

Sign in / Sign up

Export Citation Format

Share Document