Etude de l'Interaction Génotype × Niveaux de Production chez les Bovins Laitiers en Tunisie = Study of Genotype by Production Level Interaction in Tunisian Dairy Cattle = دراسة التفاعل بين التركيب الوراثي ومستوى الإنتاج عن الأبقار الحلوب في تونس

2017 ◽  
Vol 90 (90) ◽  
pp. 160-173
Author(s):  
Abir Hamrouni ◽  
M’naouer Djemali
Keyword(s):  
Dairy Cattle ◽  
Production Level

scholarly journals Milk production responses to a change in dietary starch concentration vary by production level in dairy cattle

2015 ◽  
Vol 98 (7) ◽  
pp. 4698-4706 ◽  
Author(s):  
J.P. Boerman ◽  
S.B. Potts ◽  
M.J. VandeHaar ◽  
M.S. Allen ◽  
A.L. Lock
Keyword(s):  
Dairy Cattle ◽  
Milk Production ◽  
Production Level ◽  
Starch Concentration ◽  
Dietary Starch

scholarly journals Milk production responses to dietary stearic acid vary by production level in dairy cattle

2015 ◽  
Vol 98 (3) ◽  
pp. 1938-1949 ◽  
Author(s):  
P. Piantoni ◽  
A.L. Lock ◽  
M.S. Allen
Keyword(s):  
Dairy Cattle ◽  
Stearic Acid ◽  
Milk Production ◽  
Production Level

scholarly journals First data-driven approach to using individual cattle weights to estimate mean adult dairy cattle weight in the UK

2018 ◽  
Author(s):  
Hannah E. Schubert ◽  
Sarah Wood ◽  
Kristen K. Reyher ◽  
Harriet L. Mills
Keyword(s):  
Dairy Cattle ◽  
Production Level ◽  
Average Weight ◽  
Level Data ◽  
Holstein Friesian ◽  
Data Driven Approach ◽  
Automatic Milking Systems ◽  
Common Weight ◽  
The Uk ◽  
On Farm

ABSTRACTIntroductionKnowledge of accurate weights of cattle is crucial for effective dosing of individual animals with medicine and for reporting antimicrobial usage metrics, amongst other uses. The most common weight for dairy cattle presented in current literature is 600 kg, but this is not evidenced by data. For the first time, we provide an evidence-based estimate of the average weight of UK dairy cattle to better inform decisions by farmers, veterinarians and the scientific community.MethodsWe collected data for 2,747 dairy cattle from 20 farms in the UK, 19 using Lely Automatic Milking Systems with weigh floors and 1 using a crush with weigh scales. These data covered farms with different breed types, including Holstein, Friesian, Holstein-Friesian and Jersey, as well as farms with dual purpose breeds and cross-breeds. Data were used to calculate a mean weight for dairy cattle by breed, and a UK-specific mean weight was generated by scaling to UK-specific breed proportions. Trends in weight by lactation number, DIM and production level were also explored using individual cattle-level data.ResultsMean weight for adult dairy cattle included in this study was 617 kg (standard deviation (sd) 85.6 kg). Mean weight varied across breeds, with a range of 466 kg (sd=56.0 kg, Jersey) to 636 kg (sd=84.1, Holsteins). When scaled to UK breed proportions, the estimated mean UK dairy cattle weight was 620 kg. Overall, first-lactation heifers weighed 9% less than cows. Mean weight declined for the first 30 days post-calving, before steadily increasing. For cattle at peak production, mean weight increased with production level.ConclusionsThis study is the first to calculate a mean weight of adult dairy cattle in the UK based on on-farm data. Overall mean weight was higher than that most often proposed in the literature (600 kg). Evidence-informed weights are crucial as the UK works to better monitor and report metrics to monitor antimicrobial use and are useful to farmers and veterinarians to inform dosing decisions.

scholarly journals The Impact of Milk Production Level on Profit Traits of Holstein Dairy Cattle in Korea

2013 ◽  
Vol 55 (5) ◽  
pp. 343-349 ◽  
Author(s):  
Changhee Do ◽  
Suhun Park ◽  
Kwang-Hyun Cho ◽  
Yunho Choi ◽  
Taejeong Choi ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Milk Production ◽  
Production Level ◽  
The Impact

Effects of Retinoic Acid and 1,25-Dihydroxyvitamin D3 on IFN-gamma Secretion by Mononuclear Leukocytes from Nulliparous and Postparturient Dairy Cattle

2000 ◽  
Vol 70 (3) ◽  
pp. 92-101 ◽  
Author(s):  
Burim Ametaj ◽  
Brian Nonnecke ◽  
Ronald Horst ◽  
Donald Beitz
Keyword(s):  
Retinoic Acid ◽  
Dairy Cattle ◽  
Dairy Cows ◽  
Dairy Cow ◽  
Pokeweed Mitogen ◽  
Mononuclear Leukocytes ◽  
Combined Effects ◽  
Ifn Gamma ◽  
Dihydroxyvitamin D ◽  
1,25 Dihydroxyvitamin D

Individual and combined effects of several isomers of retinoic acid (RA) and 1,25-dihydroxyvitamin D3 (1,25-(OH)2D3) on interferon-gamma (IFN-gamma) secretion by blood mononuclear leukocytes (MNL) from nulliparous and postparturient Holstein cattle were evaluated in vitro. In the first experiment, effects on incubation period (24 to 72 hours) and time of supplementation (0 to 32 hours) with all-trans, 9-cis, 13-cis-, and 9,13-dicis-RAs (0 to 100 nM) on IFN-gamma secretion by pokeweed mitogen (PWM)-stimulated (0 and 10 mug/ml) MNL from nulliparous cattle were evaluated. In the second experiment, MNL from postparturient cows (bled at 0, 2, 4, and 16 days postpartum) were stimulated with PWM (0 and 10 mug/ml) in the presence of RA isomers (9-cis- or 9,13-dicis-RA; 0 to 100 nM), 1,25-(OH)2D3 (0 to 100 nM), or with combinations of these metabolites. The results show that individual isomers of RA had no effect on IFN-gamma secretion by PWM-stimulated MNL from nulliparous or postparturient cows. Furthermore 1,25-dihydroxyvitamin D3 inhibited IFN-gamma secretion by MNL from nulliparous and postparturient dairy cows; however, the degree of inhibition was greater when 9-cis- and 9,13-dicis-RA were also present in the cultures. Finally mononuclear leukocytes from postparturient dairy cows produced substantially less IFN-gamma than did MNL from nulliparous cattle. It is concluded that retinoic acids individually did not affect the capacity of leukocytes from dairy cattle to secrete IFN-gamma. This result is in marked contrast to studies in monogastric species indicating that RAs inhibit IFN-gamma secretion by peripheral blood T cells. Inhibition of IFN-gamma secretion by 1,25-(OH)2D3 was potentiated by 9-cis- and 9,13-di-cis-retinoics acids, suggesting that an excess of dietary vitamins A and D may compromise further the naturally immunosuppressed postparturient dairy cow. Additional research is necessary to determine if the combined effects of these metabolites on IFN-gamma secretion represent an increased susceptibility of the dairy cow to infectious diseases during the periparturient period. Lower secretion of IFN-gamma by MNL from postpartutient dairy cows, relative to nulliparous cattle, suggests that recently-calved cows are naturally immunosuppressed.

Aloe vera for disinfection of teats in dairy cattle

Planta Medica ◽  
2016 ◽  
Vol 81 (S 01) ◽  
pp. S1-S381
Author(s):  
F Correia Shimamoto ◽  
P Falbo ◽  
L Sussumu Matsumoto ◽  
M Alves da Silva ◽  
RM Gonçalves da Silva ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Aloe Vera
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