The relationship between somatic cells and milk traits, and their variation in dairy sheep breeds in Slovakia

Oravcová, M.; Mačuhová, Lucia; Tančin, V.

doi:10.22358/jafs/90015/2018

Cited by 19 publications

(27 citation statements)

References 26 publications

(51 reference statements)

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“…Overall, the estimates of milk traits reported here in Barki ewes were in agreement with those estimated by Abousoliman et al [3] in Barki sheep and dairy sheep in Slovakia [14]. How-ever, some milk components were dissimilar in the Slovakian ewes (FP = 6.91% vs 4.63%, LP = 4.54% vs 6.37%) compared with those reported in this study.…”

Section: Discussionsupporting

confidence: 92%

A missense mutation in the coding region of the toll-like receptor 4 gene affects milk traits in Barki sheep

Sallam

2021

Anim Biosci

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Objective: Milk production is one of the most desirable traits in livestock. Recently, the toll-like receptor (TLR) has been identified as a candidate gene for milk traits in cows. So far, there is no information concerning the contribution of this gene in milk traits in sheep. This study was designed to investigate the TLR 4 gene polymorphisms in Barki ewes in Egypt and then correlate that with milk traits in order to identify potential single nucleotide polymorphisms (SNPs) for these traits in sheep.Methods: A part of the ovine TLR 4 gene was amplified in Barki ewes, to identify the SNPs. Consequently; Barki ewes were genotyped using polymerase chain reaction-single strand conformation polymorphism protocol. These genotypes were correlated with milk traits, which were the daily milk yield (DMY), protein percentage (PP), fat percentage (FP), lactose percentage, and total solid percentage (TSP).Results: Age and parity of the ewe had a significant effect (p<0.05 or p<0.01) on DMY, FP, and TSP. The direct sequencing identified a missense mutation located in the coding sequence of the gene (rs592076818; c.1710C>A) and was predicted to change the amino acid sequence of the resulted protein (p.Asn570Lys). The association analyses suggested a significant effect (p<0.05) of the TLR genotype on the FP and PP, while the DMY tended to be influenced as well (p = 0.07). Interestingly, the presence of the G allele tended to increase the DMY (+40.5 g/d) and significantly (p<0.05 or p<0.01) decreased the FP (–1.11%), PP (–1.21%), and TSP (–7.98%).Conclusion: The results of this study suggested the toll-like receptor 4 (TLR4) as a candidate gene to improve milk traits in sheep worldwide, which will enhance the ability to understand the genetic architecture of genes underlying SNPs that affect such traits.

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Section: Discussionsupporting

confidence: 92%

A missense mutation in the coding region of the toll-like receptor 4 gene affects milk traits in Barki sheep

Sallam

2021

Anim Biosci

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“…The daily milk yield and the length of lactation of the studied animals were more advantageous in comparison to earlier reports (Oravcová et al, 2018;Makovický et al, 2019;Margetín et al, 2020). Milk production records of the population studied were highly above the official Hungarian data (lactation milk yield: 153.6 kg, length of lactation: 126 days) (HSGBA, 2018).…”

Section: Discussionmentioning

confidence: 58%

Effect of selected factors (body weight, age, parity, litter size and temperament) on the entrance order into the milking parlour of Lacaune ewes, and its relationship with milk production

Libis-Márta¹,

Póti²,

Egerszegi³

et al. 2021

J. Anim. Feed Sci.

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“…Вчені Словаччини у своїх дослідженнях підтвердили негативний зв'язок між соматичними клітинами та молочною продуктивністю вівцематок, тобто зі збільшенням кількості соматичних клітин знижуються надої молока (Oravcová et al, 2018).…”

Section: вступunclassified

“…На думку вчених Словаччини (Oravcová et al, 2018), вміст лактози зменшується тоді, коли вміст жиру та білка збільшується разом із кількістю соматичних клітин.…”

Section: обговоренняunclassified

Quality and safety assessment of sheep milk and colostrum

Zazharska¹,

Kibets²

2020

Theor. Appl. Vet. Med.

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Sheep’s milk contains a significant amount of protein, iron, calcium, vitamins A, B and E, as well as phosphorus and magnesium, compared to cow’s milk. The purpose of research was to identify changes in physicochemical parameters, concentrations of immunoglobulins in sheep’s milk and colostrum depending on the day of lactation. The material of the study was 73 samples of ewes milk and colostrum of the Merinolandschaf breed sheep at the private enterprise «Ukrsilgosprom» in Dnipropetrovsk region. It was found that, in terms of organoleptic parameters, the samples of sheep colostrum of the first days after lambing differed significantly from the milk of the subsequent days of lactation. The color of colostrum in the first days was creamy yellow, in all other samples it varied from white to yellowish; smell – pleasant, specific to sheep’s milk, without foreign odors. The taste of colostrum was salty. The consistency of colostrum for the first three days was viscous, especially on the first day, on the following days, it was homogeneous, without mucus, not viscous. It was found that the acidity of sheep colostrum (1–7 days of lactation) ranged from 13.8°T to 34.0°T, density – from 23.2 °A to 94.1 °A. On the second day of ewes lactation, the number of somatic cells (706 ± 221×103 cells / ml) and immunoglobulins (18.72 ± 5.19 mg/ml) decreased by almost half compared with the first day (1 293 ± 231×103 cells / ml and 37.79 ± 7.45 mg/ml, respectively). Electrical conductivity was the only indicator that increased 1.5 times on the second day of lactation (4.23 ± 0.29 mS/m). On the fifth day of lactation, fat indicators (7.13 ± 0.83 %), density (34.90 ± 1.82 °A), acidity (16.7 ± 0.8 °T) almost halved in comparison with characteristics of the first-day colostrum. On the first day after lambing, the highest acidity was observed (33.9 ± 5.8 °T), which was caused by the maximum amount of immunoglobulins (37.79 ± 7.45 mg/ml) in colostrum. After lambing the number of immunoglobulins significantly decreased, on the 6th day – 4.92 ± 1.88 mg/ml (P < 0.001 compared with the first day). The obtained results allow producers of sheep’s milk and cheese to reduce the withstand of the colostrum period and to mix a secret with collected ewe’s milk on the 5th day of lactation.

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The relationship between somatic cells and milk traits, and their variation in dairy sheep breeds in Slovakia

Cited by 19 publications

References 26 publications

A missense mutation in the coding region of the toll-like receptor 4 gene affects milk traits in Barki sheep

A missense mutation in the coding region of the toll-like receptor 4 gene affects milk traits in Barki sheep

Effect of selected factors (body weight, age, parity, litter size and temperament) on the entrance order into the milking parlour of Lacaune ewes, and its relationship with milk production

Quality and safety assessment of sheep milk and colostrum

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