Reproductive Systems for North American Dairy Cattle Herds

2016 ◽  
Vol 32 (2) ◽  
pp. 267-284 ◽  
Author(s):  
Ricardo C. Chebel ◽  
Eduardo S. Ribeiro
Keyword(s):  
Dairy Cattle ◽  
North American ◽  
Reproductive Systems ◽  
Cattle Herds

Bovine viral diarrhea virus (BVDV) infection in dairy cattle herds in northeast Thailand

2016 ◽  
Vol 48 (6) ◽  
pp. 1201-1208 ◽  
Author(s):  
Theerakul Nilnont ◽  
Suneerat Aiumlamai ◽  
Kwankate Kanistanont ◽  
Chaidate Inchaisri ◽  
Jaruwan Kampa
Keyword(s):  
Dairy Cattle ◽  
Bovine Viral Diarrhea Virus ◽  
Bovine Viral Diarrhea ◽  
Northeast Thailand ◽  
Diarrhea Virus ◽  
Viral Diarrhea ◽  
Cattle Herds ◽  
Viral Diarrhea Virus

scholarly journals Antibodies against Bovine herpesvirus 1 in dairy herds in the state of Espirito Santo, Brasil

Revista CERES ◽  
2014 ◽  
Vol 61 (2) ◽  
pp. 280-283 ◽  
Author(s):  
Marcus Rebouças Santos ◽  
Hanna Carolina Campos Ferreira ◽  
Marcos Antônio dos Santos ◽  
Giuliana Loreto Saraiva ◽  
Natália Filardi Tafuri ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Neutralizing Antibodies ◽  
Bovine Herpesvirus ◽  
The State ◽  
Serum Samples ◽  
Bovine Herpesvirus 1 ◽  
Espírito Santo ◽  
Herpesvirus 1 ◽  
Cattle Herds ◽  
Espirito Santo

Bovine herpesvirus 1 (BoHV-1) causes major losses in worldwide livestock, affecting the respiratory and reproductive tracts of bovine. In the past decades, the number of cases in Brazil has been gradually increasing. Therefore, it is important to assess the distribution of infection in different regions of the country. In the state of Espírito Santo (ES) the BoHV 1 infection rate in dairy cattle herds is unknown. Thus, the aim of this study was to detect neutralizing antibodies against BoHV-1 in serum samples from 1,161 non-vaccinated cows from 59 dairy cattle herds in 23 municipalities of the Metropolitan, North, Northwest and South macro-regions. The identification of seropositive cows was evaluated by the virus neutralization test. The results showed that of all serum samples evaluated 775 (66.75%) had neutralizing antibodies against BoHV-1. Moreover, all herds were found positive; however, the percentage of positive cows varied among regions; 49.06%, 62.15%, 67.21% and 80.04% for the Metropolitan, South, North and Northwest macro-regions, respectively. In this study, the results clearly indicate the dissemination of the viral agent in dairy cattle in the ES state, requiring the monitoring and control of diseases related to BoHV-1 infection.

scholarly journals Relative contributions of neighbourhood and animal movements to Coxiella burnetii infection in dairy cattle herds

2014 ◽  
Vol 8 (2) ◽  
pp. 471 ◽  
Author(s):  
Simon Nusinovici ◽  
Thierry Hoch ◽  
Stefan Widgren ◽  
Alain Joly ◽  
Ann Lindberg ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Coxiella Burnetii ◽  
Animal Movements ◽  
Cattle Herds

Genetic parameters for gaussian and categorical traits in organic and low input dairy cattle herds based on random regression methodology

2012 ◽  
Vol 147 (1-3) ◽  
pp. 159-169 ◽  
Author(s):  
T. Yin ◽  
B. Bapst ◽  
U.U.v. Borstel ◽  
H. Simianer ◽  
S. König
Keyword(s):  
Dairy Cattle ◽  
Genetic Parameters ◽  
Random Regression ◽  
Low Input ◽  
Cattle Herds

POLYMORPHISM OF PROLACTIN AND SOMATOTROPIN GENES IN DAIRY CATTLE OF THE REPUBLIC OF TATARSTAN

2021 ◽  
pp. 22-25
Author(s):  
Р.Р. ШАЙДУЛЛИН ◽  
А.Б. МОСКВИЧЕВА ◽  
Т.Х. ФАИЗОВ ◽  
Л.Р. ЗАГИДУЛЛИН ◽  
Т.М. АХМЕТОВ ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Dna Markers ◽  
Frequency Of Occurrence ◽  
Allelic Variants ◽  
Black And White ◽  
Prolactin Gene ◽  
White Breed ◽  
White Cattle ◽  
Cattle Herds ◽  
The Republic

Изучен полиморфизм и определена частота встречаемости аллельных вариантов по генам пролактина (PRL) и соматотропина (GH) у коров в условиях двух племенных хозяйств Республики Татарстан. Объектом исследования были животные черно-пестрой породы первого (n=151) и третьего (n=168) отелов и холмогорской породы первого (n=160) и третьего (n=143) отелов. Проведено генотипирование коров по генам PRL и GH методом ДНК-диагностики. Установлено, что среди молочного скота преимущественно встречаются особи с генотипом PRL АА (70,0—77,5%), с частотой аллеля А гена пролактина — 0,83—0,87, аллеля В — 0,13—0,17. Встречаемость аллеля В была выше среди холмогорских коров (0,16—0,17). В стаде полновозрастных животных черно-пестрой породы имеется сдвиг генетического равновесия в сторону генотипов PRL AA и PRL BB (χ2=3,97; Р<0,05). В исследуемых стадах крупного рогатого скота выражено преимущество генотипа GH LL с частотой встречаемости 51,0—79,2%. Встречаемость генотипа GH VV у черно-пестрого скота составила 2,0—2,4%, у холмогорского — 5,6—7,0%. Аллель L гена соматотропина преобладает над аллелем V в обеих породах. При этом чаще встречаемость аллеля L GH среди коров холмогорской породы (0,28—0,29). У холмогорских коров больше представлены редкие и желательные аллели генов PRL и GH. Чтобы повысить встречаемость «предпочтительных» в хозяйственном отношении генотипов и аллелей ДНК-маркеров, необходимо в большей степени использовать быков-производителей с желательными аллелями PRL и GH, а именно В и V соответственно. The polymorphism was studied and the frequency of occurrence of allelic variants for the genes of prolactin (PRL) and somatotropin (GH) was determinedin cows in two bred livestock farms of the Republic of Tatarstan. The object of the study were animals of the black-and-white breed of the first (n=151) and third (n=168) calving and the Kholmogory breed of the first (n=160) and third (n=143) calving. Genotyping of cows for PRL and GH genes was carried out using method of DNA diagnostics. It was revealed that there were mainly individuals with the PRL AA genotype (70,0–77,5%)among dairy cattle, the frequency of the A allele of the prolactin gene was 0,83–0,87, the B allele was 0,13–0,17. The frequency of allele B was higher among Kholmogory cows (0,16–0,17). There was a shift in the genetic balance towards the PRL AA and PRL BB genotypes (χ2=3,97; Р<0,05) in the herd of full-age animals of the black-and-white breed. The advantage of the GH LL genotype was expressed with a frequency of occurrence 51,0–79,2% in the studied cattle herds. The occurence of the GH VV genotype was 2,0–2,4%in black-and-white cattle, 5,6–7,0% was in Kholmogorycattle. The L allele of the somatotropin gene predominated over the V allele in both breeds. Moreover, the occurrence of the L GH allele among cows of the Kholmogory breed (0,28–0,29) was more often. Rare and desirable alleles of the PRL and GH genes are more represented in Kholmogory cows. In order to increase the occurrence of economically “preferred” genotypes and alleles of DNA markers, it is necessary to use more stud bulls with the desired PRL and GH alleles, namely B and V, respectively.

scholarly journals Prevalence, quantitative load and genetic diversity of Campylobacter spp. in dairy cattle herds in Lithuania

2013 ◽  
Vol 55 (1) ◽  
Author(s):  
Sigita Ramonaitė ◽  
Anita Rokaitytė ◽  
Eglė Tamulevičienė ◽  
Alvydas Malakauskas ◽  
Thomas Alter ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Dairy Cattle ◽  
Cattle Herds ◽  
Campylobacter Spp
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