scholarly journals Pathogen-Specific Effects of Quantitative Trait Loci Affecting Clinical Mastitis and Somatic Cell Count in Danish Holstein Cattle

2008 ◽  
Vol 91 (6) ◽  
pp. 2493-2500 ◽  
Author(s):  
L.P. Sørensen ◽  
B. Guldbrandtsen ◽  
J.R. Thomasen ◽  
M.S. Lund
Keyword(s):  
Quantitative Trait Loci ◽  
Somatic Cell ◽  
Cell Count ◽  
Quantitative Trait ◽  
Somatic Cell Count ◽  
Clinical Mastitis ◽  
Holstein Cattle ◽  
Specific Effects ◽  
Trait Loci

Quantitative trait loci affecting clinical mastitis and somatic cell count in dairy cattle

2001 ◽  
Vol 12 (11) ◽  
pp. 837-842 ◽  
Author(s):  
Helge Klungland ◽  
Ayman Sabry ◽  
Bjørg Heringstad ◽  
Hanne Gro Olsen ◽  
Luis Gomez-Raya ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Dairy Cattle ◽  
Somatic Cell ◽  
Cell Count ◽  
Quantitative Trait ◽  
Somatic Cell Count ◽  
Clinical Mastitis ◽  
Trait Loci

scholarly journals Quantitative trait loci for udder conformation and other udder traits in Finnish Ayrshire cattle

2008 ◽  
Vol 16 (2) ◽  
pp. 170
Author(s):  
N.F. SCHULMAN ◽  
S.M. VIITALA ◽  
J.H. VILKKI
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Somatic Cell Count ◽  
Dairy Farms ◽  
Clinical Mastitis ◽  
Economic Losses ◽  
Breeding Programs ◽  
Trait Loci ◽  
Marker Regression ◽  
Body Stature

Udder traits are important due to their correlation with clinical mastitis which causes major economic losses to the dairy farms. Chromosomal areas associated with udder conformation traits, milking speed and leakage could be used in breeding programs to improve both udder traits and mastitis resistance. Quantitative trait loci (QTL) mapping for udder traits was carried out on bovine chromosomes (BTA) 9, 11, 14, 18, 20, 23, and 29, where earlier studies have indicated QTL for mastitis. A granddaughter design with 12 Ayrshire sire families and 360 sons was used. The sires and sons were typed for 35 markers. The traits analysed were udder depth, fore udder attachment, central ligament, distance from udder to floor, body stature, fore teat length, udder balance, rear udder height, milking speed, and leakage. Associations between markers and traits were analysed with multiple marker regression. Five genome-wise significant QTL were detected: stature on BTA14 and 23, udder balance on BTA23, rear udder height on BTA11, and central ligament on BTA23. On BTA11 and 14 the suggested QTL positions for udder traits are at the same position as previously detected QTL for mastitis and somatic cell count.;

Udder and teat conformational risk factors for elevated somatic cell count and clinical mastitis in New York Holsteins

2019 ◽  
Vol 163 ◽  
pp. 7-13 ◽  
Author(s):  
Asha M. Miles ◽  
Jessica A.A. McArt ◽  
Francisco A. Leal Yepes ◽  
Cassandra R. Stambuk ◽  
Paul D. Virkler ◽  
...  
Keyword(s):  
Risk Factors ◽  
New York ◽  
Somatic Cell ◽  
Cell Count ◽  
Somatic Cell Count ◽  
Clinical Mastitis

scholarly journals The presence of pathogens in milk of ewes in relation to the somatic cell count and subpopulations of leukocytes

2021 ◽  
Author(s):  
Tvarožková ◽  
Vašíček ◽  
Uhrinčať ◽  
Mačuhová ◽  
Hleba ◽  
...  
Keyword(s):  
Somatic Cell ◽  
Cell Count ◽  
Somatic Cell Count ◽  
Dairy Farm ◽  
Subclinical Mastitis ◽  
Clinical Mastitis ◽  
Polymorphonuclear Cells ◽  
Coagulase Negative Staphylococci ◽  
Major Health Problem ◽  
Milk Samples

Mastitis is a major health problem of the udder in dairy sheep breeds. For diagnosis of subclinical mastitis, somatic cell count (SCC) is commonly used. The presence of pathogens in the udder causes the increase of leukocytes and thus SCC in milk. Therefore, the aim of this study was to evaluate the presence of pathogens in the milk of ewes and the possible relationship with SCC. The changes of leukocytes subpopulation in milk samples with high SCC were evaluated as well. The experiment was carried out on a dairy farm with the Lacaune breed. This study was conducted on 45 ewes (98 milk samples) without signs of clinical mastitis. Based on somatic cell count, samples were divided to five SCC groups: SCC1 &lt; 200 000 cells/ml (45 milk samples); 200 000 ≤ SCC2 &lt; 400 000 cells/ml (10 milk samples); 400 000 ≤ SCC3 &lt; 600 000 cells/ml (six milk samples); 600 000 ≤ SCC4 &lt; 1 000 000 cells/ml (six milk samples); SCC5 ≥ 1 000 000 cells/ml (31 milk samples). No pathogens were observed in the majority of milk samples (60.20%). Coagulase-negative staphylococci (CNS) were the most commonly isolated pathogens from the milk of ewes (86.11%). Staphylococcus epidermidis had the highest incidence from CNS (35.48%). In the SCC5 group, up to 79.31% of bacteriological samples were positive. The percentage of leukocytes significantly increased (P &lt; 0.001) in the samples with higher SCC (≥ 200 × 10<sup>3</sup> cells/ml) in comparison to the group SCC1. Also, the percentage of polymorphonuclear cells (PMNs) was significantly higher with increasing SCC (P &lt; 0.001). In conclusion, the presented results showed that the high SCC was caused by the presence of the pathogen in milk. Thus SCC &lt; 200 000 cells/ml and leukocyte subpopulation, especially PMNs, could be considered as important tools in udder health programs applied in dairy ewes.

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