PubAg

Main content area

You searched for: Subject "dairy cows" Remove constraint Subject: "dairy cows"
Start Over

Search

10,208  Search Results

« Previous | 1 - 20 of 10,208 |
Number of results to display per page

Search Results

1. Reproducibility of endometrial cytology using cytobrush technique and agreement for the diagnosis of subclinical endometritis between five predefined endometrial sites

Author:
Pothmann, Harald; Müller, Jessica; Pothmann, Isabella; Tichy, Alexander; Drillich, Marc
Source:
Reproduction in domestic animals 2019 v.54 no.2 pp. 350-357
ISSN:
0936-6768
Subject:
dairy cows,   etc   ; endometritis; endometrium; neutrophils; probability;     Show all 5 Subjects
Abstract:
... The objectives of this study were as follows: (a) to assess the reproducibility of polymorphonuclear neutrophil (PMN) cell counts at five predefined endometrial sites (corpus uteri, left horn base, right horn base, left horn tip and right horn tip) and (b) to determine the agreement for the diagnosis of subclinical endometritis (SE) between the different endometrial sites. Forty milking cows betwe ...
DOI:
10.1111/rda.13367

2. Lameness detection of dairy cows based on a double normal background statistical model

Author:
Jiang, Bo; Song, Huaibo; He, Dongjian
Source:
Computers and electronics in agriculture 2019 v.158 pp. 140-149
ISSN:
0168-1699
Subject:
dairy cows,   etc   ; algorithms; animal welfare; lameness; normal distribution; statistical models;     Show all 6 Subjects
Abstract:
... Dairy cow lameness is one of the diseases that affect the health of dairy cows, and the rapid and accurate detection of dairy cow lameness is an important research field for modern dairy cow farming. In this study, a lameness detection method based on a double normal distribution statistical model was proposed. The combination of these features could be used to determine the lameness of dairy cows ...
DOI:
10.1016/j.compag.2019.01.025

3. Effect of plasma progesterone on oocyte recovery, oocyte quality, and early in-vitro developmental competence of embryos in Bos indicus dairy cows

Author:
Saad, Muhammad; Sarwar, Zaeem; Saleem, Muhammad; Arshad, Usman; Shahzad, Muhammad; Hassan Mushtaq, Muhammad; Husnain, Ali; Riaz, Amjad; Ahmad, Nasim
Source:
Animal reproduction science 2019
ISSN:
0378-4320
Subject:
dairy cows,   etc   ; animal ovaries; blood serum; oocytes; progesterone; slaughterhouses; zebu;     Show all 7 Subjects
Abstract:
... The objective of present study was to determine the effect of plasma progesterone (P4) on oocyte recovery, oocyte quality, and early in-vitro developmental competence of embryos in Bos indicus dairy cows. The ovaries were collected in an abattoir. These ovaries (n = 750) were divided into two groups: 1) estrous CYCLIC (n = 318), and 2) estrous ACYCLIC (n = 432). Mean serum concentrations of P4 in ...
DOI:
10.1016/j.anireprosci.2019.02.001

4. Development and validation of a measurement scale for self-efficacy for farmers’ mastitis prevention in dairy cows

Author:
Lind, Nina; Hansson, Helena; Lagerkvist, Carl Johan
Source:
Preventive veterinary medicine 2019 v.167 pp. 53-60
ISSN:
0167-5877
Subject:
dairy cows,   etc   ; cognition; dairy industry; farmers; mastitis; questionnaires; self-efficacy; udders;     Show all 8 Subjects
Abstract:
... The purpose of this study was twofold. First, we developed and validated the domain-specific Mastitis Prevention Self-Efficacy scale (MPSES), derived from developing a corresponding scale for the General Self-Efficacy Scale and consisting of 10 items describing dairy farmers’ feelings of confidence about being able to prevent, reduce and control mastitis, a common infection of the udder. Second, f ...
DOI:
10.1016/j.prevetmed.2019.03.025

5. Automated body condition scoring of dairy cows using 3-dimensional feature extraction from multiple body regions

Author:
Song, X.; Bokkers, E.A.M.; van Mourik, S.; Groot Koerkamp, P.W.G.; van der Tol, P.P.J.
Source:
Journal of dairy science 2019 v.102 no.5 pp. 4294-4308
ISSN:
0022-0302
Subject:
dairy cows,   etc   ; automation; body condition; body regions; cameras; computer vision; data collection; lactating females; lactation; models;     Show all 10 Subjects
Abstract:
... Machine vision technology has been used in automated body condition score (BCS) classification of dairy cows. The current vision-based classifications use information acquired from a limited number of body regions of the cow. Our study aimed to improve automated BCS classification by including multiple body condition–related features extracted from 3 viewpoints in 8 body regions. The data set of t ...
DOI:
10.3168/jds.2018-15238

6. Technical note: Validation of an ear-tag accelerometer to identify feeding and activity behaviors of tiestall-housed dairy cattle

Author:
Zambelis, A.; Wolfe, T.; Vasseur, E.
Source:
Journal of dairy science 2019 v.102 no.5 pp. 4536-4540
ISSN:
0022-0302
Subject:
dairy cows,   etc   ; accelerometers; covariance; dairy herds; ears; free stalls; grazing; ingestion; lactating females; lactation; models; rumination;     Show all 12 Subjects
Abstract:
... The objective of this study was to validate the CowManager SensOor ear-tag accelerometer (Agis Automatisering BV, Harmelen, the Netherlands) against visual observations of feeding, rumination, resting, and active behaviors of tiestall-housed dairy cows. Prior validation of the sensor has been published for freestall and grazing dairy herds. However, the behavioral differences that exist among thes ...
DOI:
10.3168/jds.2018-15766

7. Technical note: Using an electronic drinker to monitor competition in dairy cows

Author:
McDonald, Paige V.; von Keyserlingk, Marina A.G.; Weary, Daniel M.
Source:
Journal of dairy science 2019 v.102 no.4 pp. 3495-3500
ISSN:
0022-0302
Subject:
dairy cows,   etc   ; drinking; ear tags; graphs; head; lactating females; lactation; transponders; video recording;     Show all 9 Subjects
Abstract:
... The objective of this study was to determine whether data from an electronic drinking system that tracks individual animal attendance with ear tag transponders could be used to detect social competition between dairy cows at the drinker. Specifically, we sought to identify the interval between one cow leaving the drinker and another cow taking her place that most accurately identified competitive ...
DOI:
10.3168/jds.2018-15585

8. Infrared thermography measured body surface temperature and its relationship with rectal temperature in dairy cows under different temperature-humidity indexes

Author:
Peng, D.; Chen, S.; Li, G.; Chen, J.; Wang, J.; Gu, X.
Source:
International journal of biometeorology 2019 v.63 no.3 pp. 327-336
ISSN:
0020-7128
Subject:
dairy cows,   etc   ; Holstein; bioclimatology; ears; eyes; heat stress; rump; somatotropin; surface temperature; thermography; udders;     Show all 11 Subjects
Abstract:
... The aim of this study was to better understand the inflection point of RT and BSTs and measure different body surface temperatures (BSTs) under different temperature-humidity index (THI) conditions. A total of 488 Holstein dairy cows were chosen to manually measure rectal temperature (RT) and BSTs including left side of eye, ear, cheek, forehead, flank, rump, fore udder, and rear udder by infrared ...
DOI:
10.1007/s00484-018-01666-x

9. Classification of ingestive-related cow behaviours using RumiWatch halter and neck-mounted accelerometers

Author:
Benaissa, Said; Tuyttens, Frank A.M.; Plets, David; Cattrysse, Hannes; Martens, Luc; Vandaele, Leen; Joseph, Wout; Sonck, Bart
Source:
Applied animal behaviour science 2019 v.211 pp. 9-16
ISSN:
0168-1591
Subject:
dairy cows,   etc   ; accelerometers; animal behavior; decision support systems; support vector machines;     Show all 5 Subjects
Abstract:
... A new simple decision-tree (DT) algorithm was developed using the data from a neck-mounted accelerometer for real-time classification of feeding and ruminating behaviours of dairy cows. The performance of the DT was compared to that of a support vector machine (SVM) algorithm and a RumiWatch noseband sensor and the effect of decreasing the sampling rate of the accelerometer on the classification a ...
DOI:
10.1016/j.applanim.2018.12.003

10. Dairy cow preference for access to an outdoor pack in summer and winter

Author:
Smid, A.M.C.; Burgers, E.E.A.; Weary, D.M.; Bokkers, E.A.M.; von Keyserlingk, M.A.G.
Source:
Journal of dairy science 2019 v.102 no.2 pp. 1551-1558
ISSN:
0022-0302
Subject:
dairy cows,   etc   ; barns; free stalls; habituation; lactating females; lactation; microprocessors; summer; wind speed; winter;     Show all 10 Subjects
Abstract:
... The aim of our study was to test the preference of freestall-housed dairy cows to access an outdoor deep-bedded open pack (versus remaining inside the freestall barn) in the summer and winter. A secondary aim was to investigate how preference for outdoor access influenced feeding, lying, and stall perching behavior. Eight groups of pregnant, lactating cows were tested in the summer and 9 groups in ...
DOI:
10.3168/jds.2018-15007

11. Fertility of lactating dairy cows inseminated with sex‐sorted or conventional semen after Ovsynch, Presynch–Ovsynch and Double‐Ovsynch protocols

Author:
Karakaya‐Bilen, Ebru; Yilmazbas‐Mecitoglu, Gulnaz; Keskin, Abdulkadir; Guner, Barıs; Serim, Enes; Santos, José E. P.; Gümen, Ahmet
Source:
Reproduction in domestic animals 2019 v.54 no.2 pp. 309-316
ISSN:
0936-6768
Subject:
dairy cows,   etc   ; artificial insemination; bulls; freeze-thaw cycles; insemination; lactating females; lactation; pregnancy; semen;     Show all 9 Subjects
Abstract:
... The objective was to compare pregnancy per artificial insemination (P/AI) with conventional (CS) or sex‐sorted semen (SS) in dairy cows subjected to one of the three timed AI protocols. Cows (n = 356) were randomly assigned to synchronization with Ovsynch (OVS), Presynch–Ovsynch (PO) or Double‐Ovsynch (DO) and inseminated on Day 77 ± 3 postpartum with either frozen‐thawed SS (n = 182) or CS (n = 1 ...
DOI:
10.1111/rda.13363

12. Protease activity and protein profile in milk from healthy dairy cows and cows with different types of mastitis

Author:
Caggiano, N.; Lorenzo Smirnoff, A.; Bottini, J.M.; De Simone, E.A.
Source:
International dairy journal 2019 v.89 pp. 1-5
ISSN:
0958-6946
Subject:
dairy cows,   etc   ; enzyme activity; kappa-casein; mastitis; milk; milk production; morbidity; mortality; protein composition; proteinases;     Show all 10 Subjects
Abstract:
... Mastitis in dairy cattle has high morbidity and mortality rates, having serious consequences in milk production and quality. The aim of this work was to evaluate the activity of metalloproteinase-2 (MMP-2) and metalloproteinase-9 (MMP-9) in milk from healthy dairy cattle and from cows with signs of clinical and subclinical mastitis. The levels of total proteins and proteases with caseinolytic acti ...
DOI:
10.1016/j.idairyj.2018.07.020

13. Transmission dynamics of Staphylococcus aureus within two Danish dairy cattle herds

Author:
Kirkeby, C.; Zervens, L.; Toft, N.; Schwarz, D.; Farre, M.; Hechinger, S.; Halasa, T.
Source:
Journal of dairy science 2019 v.102 no.2 pp. 1428-1442
ISSN:
0022-0302
Subject:
dairy cows,   etc   ; Staphylococcus aureus; dairy herds; decision making; longitudinal studies; pathogens; simulation models;     Show all 7 Subjects
Abstract:
... Staphylococcus aureus is a major pathogen causing intramammary infections (IMI) in dairy cattle herds worldwide. Simulation models can be used to investigate the epidemiologic and economic outcomes of different control strategies against IMI. The transmission rate parameter is one of the most influential parameters on the outcomes of these simulation models. Very few studies have estimated the tra ...
DOI:
10.3168/jds.2018-15106

14. Variable segmentation and ensemble classifiers for predicting dairy cow behaviour

Author:
Williams, Manod L.; James, Wiliam P.; Rose, Michael T.
Source:
Biosystems engineering 2019 v.178 pp. 156-167
ISSN:
1537-5110
Subject:
dairy cows,   etc   ; algorithms; artificial intelligence; global positioning systems; grazing; logit analysis; models; pastures; prediction; walking;     Show all 10 Subjects
Abstract:
... Automatically classifying cattle behaviour using high frequency data usually involves segmentation of data with fixed window sizes for feature extraction. Machine learning algorithms can then be used for supervised modelling of the most biologically important behaviours using these segments. In this work, variable segmentation was applied to GPS data gathered from 30 dairy cows at pasture. Using t ...
DOI:
10.1016/j.biosystemseng.2018.11.011

15. Mechanism of peptide absorption in the isolated forestomach epithelial cells of dairy cows

Author:
Xu, Qingbiao; Liu, Hongyun; Zhao, Fengqi; Wu, Yueming; Huang, Xinbei; Liu, Zhixuan; Liu, Jianxin
Source:
Journal of the science of food and agriculture 2019 v.99 no.1 pp. 100-108
ISSN:
0022-5142
Subject:
dairy cows,   etc   ; antibodies; dipeptides; epithelial cells; forestomach; nutrition; pH; peptide transporters; uptake mechanisms;     Show all 9 Subjects
Abstract:
... BACKGROUND: Peptide absorption from the forestomach plays a vital role in protein nutrition of dairy cows. This study was conducted to investigate the mechanism of dipeptide absorption in the forestomach of dairy cows using isolated omasal epithelial cells (OECs) and ruminal epithelial cells (RECs). RESULTS: Compared with RECs, the OECs formed a less tight monolayer, but had greater ability to tra ...
DOI:
10.1002/jsfa.9148

16. Duration-controlled grazing of dairy cows. 1: Impacts on pasture growth, cow intakes and nutrient transfer

Author:
Christensen, Christine L.; Hedley, Mike J.; Hanly, James A.; Horne, David J.
Source:
New Zealand journal of agricultural research 2019 v.62 no.1 pp. 23-47
ISSN:
1175-8775
Subject:
dairy cows,   etc   ; annual pastures; drainage; excreta; grazing; models; nitrogen; nutrient content; nutrients; phosphorus; potassium; runoff;     Show all 12 Subjects
Abstract:
... Standing cows off pasture after 4 hours of grazing (duration-controlled (DC) grazing) was researched over 3 years (2008–2011) to compare the losses of nutrients in drainage and surface runoff water with losses under standard grazing (SG). Pasture growth rates, nutrient concentrations and apparent intake by cows were used to model nutrient removals from, and returns to, pasture. Pre- and post-grazi ...
DOI:
10.1080/00288233.2017.1418395

17. Duration-controlled grazing of dairy cows. 2: nitrogen losses in sub-surface drainage water and surface runoff

Author:
Christensen, Christine L.; Hedley, Mike J.; Hanly, James A.; Horne, David J.
Source:
New Zealand journal of agricultural research 2019 v.62 no.1 pp. 48-68
ISSN:
1175-8775
Subject:
dairy cows,   etc   ; autumn; grazing; grazing management; leaching; nitrate nitrogen; nitrogen; runoff; soil; subsurface drainage; urine; winter;     Show all 12 Subjects
Abstract:
... The annual quantities of nitrate-N (-N) and total N (TN) leached from mole and pipe drained dairy pastures on a Pallic soil, were reduced by an average of 52% and 42% (p < .05), respectively, by standing cows off pasture to ruminate and rest after grazing (Duration-controlled grazing, DC), compared to the standard grazing management (SG) of leaving cows at pasture between milkings. For the SG trea ...
DOI:
10.1080/00288233.2017.1418396

18. Effect of Age at First Calving on First Lactation Milk Yield, Lifetime Milk Production And Longevity of Cows

Author:
Sawa, Anna; Siatka, Kamil; Krężel-Czopek, Sylwia
Source:
Annals of animal science 2019 v.19 no.1 pp. 189-200
ISSN:
2300-8733
Subject:
dairy cows,   etc   ; Holstein; calving; herds; lactation; longevity; milk yield; milking; rearing; udders; Poland;     Show all 11 Subjects
Abstract:
... The objective of the study was to analyse the effect of age at first calving (AFC) on first lactation milk yield, lifetime milk production and longevity of dairy cows. The study used SYMLEK data on the milk yield and culling of 111 857 Polish Holstein-Friesian cows from the active population in Pomerania and Kujawy, Poland. The cows first calved during 2000–2009 and were used or removed from the h ...
DOI:
10.2478/aoas-2018-0044

19. A description of interestrus and interservice intervals and associated fertility in 16 United Kingdom dairy herds

Author:
Greenham, T.; Oikonomou, G.; Grove-White, D.H.
Source:
Journal of dairy science 2019 v.102 no.1 pp. 824-832
ISSN:
0022-0302
Subject:
dairy cows,   etc   ; conception; dairy herds; estrus; insemination; lactation; milk; models; pregnancy; regression analysis; United Kingdom;     Show all 11 Subjects
Abstract:
... Understanding the changes that have occurred in reproductive management and physiology of the dairy cow is necessary to reverse the trend of declining fertility. In this study we analyzed the intervals between estrus events, as detected using tail chalk, in a population of 6,092 dairy cows from 16 herds in the central United Kingdom. Intervals were categorized by absence or presence of an insemina ...
DOI:
10.3168/jds.2018-14755

20. Comprehensive analysis of affiliative and agonistic social networks in lactating dairy cattle groups

Author:
Foris, Borbala; Zebunke, Manuela; Langbein, Jan; Melzer, Nina
Source:
Applied animal behaviour science 2019 v.210 pp. 60-67
ISSN:
0168-1591
Subject:
dairy cows,   etc   ; animal behavior; guidelines; herds; lactating females; lactation; social environment; social networks;     Show all 8 Subjects
Abstract:
... The social environment of dairy cattle is important for their welfare under modern housing and management conditions. Social tension can negatively affect individuals even in a well-designed and healthy environment whereas affiliative behaviour may improve their well-being. The complex social relationships in a herd can be described comprehensively using network analysis. However, no up-to-date gu ...
DOI:
10.1016/j.applanim.2018.10.016