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VetMed Resource

Veterinary information to support practice, based on evidence and continuing education

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Abstract

Transrectal palpation of the reproductive tract is the most common method for pregnancy determination in cattle and is considered a veterinary skill that new veterinary medicine (DVM) graduates should perform proficiently. However, using privately owned cattle to train students can be difficult...

Author(s)
Bond, R. L.; Midla, L. T.; Gordon, E. D.; Welker, F. H. B.; Masterson, M. A.; Mathys, D. A.; Mollenkopf, D. F.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2019, 102, 10, pp 9236-9240
Abstract

Genomic prediction is widely used to select candidates for breeding. Size and composition of the reference population are important factors influencing prediction accuracy. In Holstein dairy cattle, large reference populations are used, but this is difficult to achieve in numerically small breeds...

Author(s)
Berg, I. van den; Meuwissen, T. H. E.; MacLeod, I. M.; Goddard, M. E.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2019, 102, 4, pp 3155-3174
Abstract

Genetic evaluation of female fertility in Danish, Finnish, and Swedish dairy cows was updated in 2015 to multiple-trait animal model evaluation, where heifer and cow fertility up to third parity are considered as separate traits. A model for conception rate was also developed, which required...

Author(s)
Muuttoranta, K.; Tyrisevä, A. M.; Mäntysaari, E. A.; Pösö, J.; Aamand, G. P.; Lidauer, M. H.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2019, 102, 9, pp 8184-8196
Abstract

Milk pH is increased in lactating dairy cattle with subclinical mastitis (SCM) and intramammary infection (IMI). We hypothesized that milk pH testing provides an accurate, low-cost, and practical on-farm method for diagnosing SCM and IMI. The main objective was to evaluate the clinical utility of...

Author(s)
Kandeel, S. A.; Megahed, A. A.; Ebeid, M. H.; Constable, P. D.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2019, 102, 2, pp 1417-1427
Abstract

The variance of gametic diversity (σgamete2) can be used to find individuals that more likely produce progeny with extreme breeding values. The aim of this study was to obtain this variance for individuals from routine genomic evaluations, and to apply gametic variance in a selection criterion in...

Author(s)
Santos, D. J. A.; Cole, J. B.; Lawlor, T. J.; VanRaden, P. M.; Tonhati, H.; Ma, L.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2019, 102, 6, pp 5279-5294
Abstract

In this study, we compared multiple logistic regression, a linear method, to naive Bayes and random forest, 2 nonlinear machine-learning methods. We used all 3 methods to predict individual survival to second lactation in dairy heifers. The data set used for prediction contained 6,847 heifers born...

Author(s)
Heide, E. M. M. van der; Veerkamp, R. F.; Pelt, M. L. van; Kamphuis, C.; Athanasiadis, I.; Ducro, B. J.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2019, 102, 10, pp 9409-9421
Abstract

This study was conducted to determine the effects of bypass fat on postpartum reproductive performance in dairy cattle. A total of 40 advance pregnant crossbred dairy cows of 2nd to 5th parity were randomly divided into two groups, control (n=10) and treatment (n=30). The control animals were...

Author(s)
Nirwan, S. S.; Mehta, J. S.; Ashok Kumar; Pramod Kumar; Arvind Kumar; Vikramjit Singh
Publisher
Indian Dairy Association, New Delhi, India
Citation
Indian Journal of Dairy Science, 2019, 72, 2, pp 194-200
Abstract

Fatty liver is a common condition affecting dairy cattle during the periparturient period, characterized by a pathological accumulation of triglycerides (TG) in the hepatocytes. The objective of this study was to evaluate the diagnostic potential of fine needle aspiration cytology in fresh liver...

Author(s)
Melendez, P.; Whitney, M.; Williams, F.; Pinedo, P.; Manriquez, D.; Moore, S. G.; Lucy, M. C.; Pithua, P.; Poock, S. E.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2018, 101, 5, pp 4483-4490
Abstract

Our objective was to combine the methods of geometric morphometrics and multivariate quantitative genetics to genetic evaluation of the size and shape of lactation curves of milk of 3,492 Israeli first-parity Holstein cattle. Lactation records were treated as morphological data, for which 2...

Author(s)
Durón-Benítez, A. A.; Weller, J. I.; Ezra, E.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2018, 101, 12, pp 11132-11142
Abstract

The reliable detection of estrus is an important scientific and practical challenge in dairy cattle farming. Female vocalization may indicate reproductive status, and preliminary evidence suggests that this information can be used to detect estrus in dairy cattle. The aim of this study was to...

Author(s)
Röttgen, V.; Becker, F.; Tuchscherer, A.; Wrenzycki, C.; Düpjan, S.; Schön, P. C.; Puppe, B.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2018, 101, 3, pp 2383-2394

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