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https://www.readbyqxmd.com/read/28436343/implications-of-feed-concentrate-reduction-in-organic-grassland-based-dairy-systems-a-long-term-on-farm-study
#1
F Leiber, I K Schenk, A Maeschli, S Ivemeyer, J O Zeitz, S Moakes, P Klocke, P Staehli, C Notz, M Walkenhorst
In response to increasing efforts for reducing concentrate inputs to organic dairy production in grassland-rich areas of Europe, a long-term study was conducted, which assessed the impacts of concentrate reductions on cows' performance, health, fertility and average herd age. In total, 42 Swiss commercial organic dairy cattle farms were monitored over 6 years ('Y0', 2008/09 until 'Y5', 2013/14). In comparison with overall data of Swiss herdbooks (including conventional and organic farms), the herds involved in the project had lower milk yields, similar milk solids, shorter calving intervals and higher average lactation numbers...
April 24, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28435198/association-between-udder-morphology-and-in-vitro-activity-of-milk-leukocytes-in-high-yielding-crossbred-cows
#2
Tripti Sharma, Pradip Kumar Das, Prabal Ranjan Ghosh, Dipak Banerjee, Joydip Mukherjee
AIM: The present investigation was conducted to study the association between udder morphology and in vitro activity of milk leukocytes in high yielding crossbred cows. MATERIALS AND METHODS: A total of 48 healthy high yielding crossbred cows were selected for the study. The udder configuration and teat/udder morphology were recorded before milking. Milk samples (100 ml/cow) were collected aseptically. Milk somatic cell counts (SCC) and milk differential leukocyte counts were performed microscopically...
March 2017: Veterinary World
https://www.readbyqxmd.com/read/28435193/can-methicillin-resistant-staphylococcus-aureus-prevalence-from-dairy-cows-in-india-act-as-potential-risk-for-community-associated-infections-a-review
#3
REVIEW
Sathish Gopal, Kurunchi C Divya
Methicillin-resistant Staphylococcus aureus (MRSA) is classified as hospital associated (HA), community associated (CA), livestock associated (LA) and is a global concern. Developing countries, like India, are densely populated country challenging for public hygiene practices. HA-MRSA is comfortably recorded in India, and CA-MRSA is also reported as increasing one. CA-MRSA is serious disease which affects the community as endemic. MRSA is one among major mastitis-causing organisms in India as LA-MRSA. There were reports for transmission of MRSA as community between milk handlers and cow in global perspective...
March 2017: Veterinary World
https://www.readbyqxmd.com/read/28435189/in-vitro-evaluation-of-total-mixed-ration-supplemented-with-exogenous-fibrolytic-enzymes-for-crossbred-cows
#4
Pravin Mohan Lunagariya, Ram Sharan Gupta, Subhash Parnerkar
AIM: The study was conducted to evaluate the levels of exogenous fibrolytic enzymes (EFE) on in vitro digestibilities of dry matter (DM) and organic matter (OM), total gas production (TGP), metabolizable energy (ME) content, and microbial biomass production (MBP). MATERIALS AND METHODS: The total mixed ration (TMR) was prepared using 30% each of sorghum hay and groundnut straw and 40% compound concentrate mixture to meet nutritional requirement of cow (500 kg) producing 12 kg fat corrected milk...
March 2017: Veterinary World
https://www.readbyqxmd.com/read/28434752/effects-of-intrauterine-infusion-of-escherichia-coli-lipopolysaccharide-on-uterine-health-resolution-of-purulent-vaginal-discharge-and-reproductive-performance-of-lactating-dairy-cows
#5
João G N Moraes, Paula R B Silva, Luís G D Mendonça, Alexandre A Scanavez, Joseane C C Silva, Ricardo C Chebel
The objectives of the current experiment were to evaluate the effects of intrauterine infusion of Escherichia coli lipopolysaccharide (LPS) in cows diagnosed with purulent vaginal discharge (PVD) on intrauterine cell population, resolution of PVD, uterine health, and reproductive performance. Jersey cows (n = 3,084) were examined using the Metricheck device to diagnose PVD at 35 ± 6 d postpartum. Purulent vaginal discharge was defined as the presence of purulent (≥50% pus) discharge detectable in the vagina...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28434750/integrating-an-automated-activity-monitor-into-an-artificial-insemination-program-and-the-associated-risk-factors-affecting-reproductive-performance-of-dairy-cows
#6
Tracy A Burnett, Augusto M L Madureira, Bruna F Silper, A C C Fernandes, Ronaldo L A Cerri
The aim of this study was to compare 2 reproductive programs for the management of first postpartum artificial insemination (AI) based on activity monitors and timed AI, as well as to determine the effect of health-related factors on detection and expression of estrus. Lactating Holstein cows (n = 918) from 2 commercial farms were enrolled. Estrous cycles of all cows were presynchronized with 2 injections of PGF2α administered 2 wk apart. Treatments were (1) first insemination performed by timed AI (TAI) and (2) first insemination based upon the detection of estrus by activity monitors (ACT; Heatime, SCR Engineering, Netanya, Israel) after the presynchronization, whereas cows not inseminated by the detection of estrus were enrolled in the Ovsynch protocol...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28434747/bivariate-threshold-models-for-genetic-evaluation-of-susceptibility-to-and-ability-to-recover-from-mastitis-in-danish-holstein-cows
#7
B G Welderufael, L L G Janss, D J de Koning, L P Sørensen, P Løvendahl, W F Fikse
Mastitis in dairy cows is an unavoidable problem and genetic variation in recovery from mastitis, in addition to susceptibility, is therefore of interest. Genetic parameters for susceptibility to and recovery from mastitis were estimated for Danish Holstein-Friesian cows using data from automatic milking systems equipped with online somatic cell count measuring units. The somatic cell count measurements were converted to elevated mastitis risk, a continuous variable [on a (0-1) scale] indicating the risk of mastitis...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28434746/supplementing-an-immunomodulatory-feed-ingredient-to-modulate-thermoregulation-physiologic-and-production-responses-in-lactating-dairy-cows-under-heat-stress-conditions
#8
T Leiva, R F Cooke, A P Brandão, K M Schubach, L F D Batista, M F Miranda, E A Colombo, R O Rodrigues, J R G Junior, R L A Cerri, J L M Vasconcelos
This study compared vaginal temperature, physiologic, and productive parameters in lactating dairy cows supplemented or not with Omnigen-AF (Phibro Animal Health, Teaneck, NJ) during the summer months in a tropical environment. Thirty-two lactating, primiparous (n = 16) and multiparous (n = 16) pregnant Holstein × Gir cows were ranked by parity, days in milk, body weight, and body condition score (BCS), and assigned to receive (SUPP; n = 16) or not (CON; n = 16) Omnigen-AF (Phibro Animal Health, Teaneck, NJ) at 56 g/cow daily (as-fed basis)...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28434740/effects-of-prepartum-dietary-cation-anion-difference-on-aspects-of-peripartum-mineral-and-energy-metabolism-and-performance-of-multiparous-holstein-cows
#9
B M Leno, C M Ryan, T Stokol, D Kirk, K P Zanzalari, J D Chapman, T R Overton
The objectives of this study were to determine the effect of decreasing dietary cation-anion difference [DCAD; (Na(+) + K(+)) - (Cl(-) + S(2-))] of the prepartum diet on aspects of mineral metabolism, energy metabolism, and performance of peripartum dairy cows. Multiparous Holstein cows (n = 89) were enrolled between 38 and 31 d before expected parturition and randomized to treatments in a completely randomized design (restricted to balance for previous 305-d mature equivalent milk production, parity, and body condition score) at 24 d before expected parturition...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28434739/the-effect-of-conjugated-linoleic-acid-acetate-and-their-interaction-on-adipose-tissue-lipid-metabolism-in-nonlactating-cows
#10
N Urrutia, Y Ying, K J Harvatine
During biohydrogenation-induced milk fat depression, adipose tissue lipogenesis may be increased through nutrients spared from milk fat synthesis. However, the direct effect of trans-10, cis-12 conjugated linoleic acid (CLA) and the indirect effect of spared nutrients on adipose tissue lipogenesis during milk fat depression is not clear. The objective of this study was to determine the direct effect of CLA, spared acetate, and their interaction on adipose tissue lipogenesis using nonlactating dairy cows as an experimental model, which allows separation of the effect of CLA and nutrient sparing...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28434737/short-communication-microbiological-quality-of-raw-cow-milk-and-its-association-with-herd-management-practices-in-northern-china
#11
X Y Lan, S G Zhao, N Zheng, S L Li, Y D Zhang, H M Liu, J McKillip, J Q Wang
Contamination of raw milk with bacterial pathogens is potentially hazardous to human health. The aim of this study was to evaluate the total bacteria count (TBC) and presence of pathogens in raw milk in Northern China along with the associated herd management practices. A total of 160 raw milk samples were collected from 80 dairy herds in Northern China. All raw milk samples were analyzed for TBC and pathogens by culturing. The results showed that the number of raw milk samples with TBC <2 × 10(6) cfu/mL and <1 × 10(5) cfu/mL was 146 (91...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28434736/incidence-of-clinical-mastitis-and-distribution-of-pathogens-on-large-chinese-dairy-farms
#12
Jian Gao, Herman W Barkema, Limei Zhang, Gang Liu, Zhaoju Deng, Lingjie Cai, Ruixue Shan, Shiyao Zhang, Jiaqi Zou, John P Kastelic, Bo Han
Knowledge of the incidence of clinical mastitis (CM) and the distribution of pathogens involved is essential for development of prevention and control programs as well as treatment protocols. No country-wide study on the incidence of CM and the distribution of pathogens involved has been conducted in China. Core objectives of this study were, therefore, to determine the cumulative incidence of CM and the distribution of pathogens causing CM on large Chinese (>500 cows) dairy farms. In addition, associations between the distribution of CM pathogens and bedding materials and seasonal factors were also investigated...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28434734/cow-level-associations-of-lameness-behavior-and-milk-yield-of-cows-milked-in-automated-systems
#13
M T M King, S J LeBlanc, E A Pajor, T J DeVries
This study evaluated differences in behavior and productivity between lame and nonlame cows in herds with automated milking systems (AMS). We monitored 30 cows per herd on 41 farms with AMS in Canada (26 herds in Ontario and 15 herds in Alberta). During a 6-d period, milking data (n = 1,184) and lying behavior data (n = 1,209) were collected from cows on 41 farms. Rumination behavior (n = 569) and activity (n = 615) data were available for cows at 22 farms. Locomotion was scored using a numerical rating system (NRS; 1 = sound; 5 = extremely lame)...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28434729/effects-of-intrauterine-infusion-of-escherichia-coli-lipopolysaccharide-on-uterine-mrna-gene-expression-and-peripheral-polymorphonuclear-leukocytes-in-jersey-cows-diagnosed-with-purulent-vaginal-discharge
#14
João G N Moraes, Luís G D Mendonça, Paula R B Silva, Alexandre A Scanavez, Klibs N Galvão, Michael A Ballou, Milli Worku, Ricardo C Chebel
The objectives of the current experiment were to investigate the effects of intrauterine treatment of cows with purulent vaginal discharge (PVD) using lipopolysaccharide (LPS) from Escherichia coli on uterine mRNA expression of genes related to inflammatory responses, peripheral polymorphonuclear leukocyte (PMN) function, hematological parameters, and blood concentrations of cortisol, haptoglobin, and progesterone (P4). Jersey cows (n = 3,084) were examined for PVD at 35 ± 6 d postpartum using the Metricheck device (Simcro, Hamilton, New Zealand)...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28434727/short-term-effects-of-soybean-oil-supplementation-on-performance-digestion-and-metabolism-in-dairy-cows-fed-sugarcane-based-diets
#15
João Paulo P Rodrigues, Ricardo M de Paula, Luciana N Rennó, Marta M S Fontes, Andreia F Machado, Sebastião de C Valadares Filho, Pekka Huhtanen, Marcos I Marcondes
We aimed to quantify the productive and metabolic responses, and digestive changes in dairy cows fed various concentrations of soybean oil (SBO) in high-concentrate, sugarcane-based diets. Eight rumen-cannulated multiparous Holstein cows in mid lactation (574 ± 19.1 kg of body weight and 122 ± 6.9 d in milk), averaging 22.5 ± 1.22 kg/d of milk were assigned to replicated 4 × 4 Latin squares. The experimental period lasted 21 d as follows: 14 d for adaptation, followed by a sampling period from d 15 to 21...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28434725/effects-of-breed-feeding-system-and-lactation-stage-on-milk-fat-characteristics-and-spontaneous-lipolysis-in-dairy-cows
#16
E Vanbergue, L Delaby, J L Peyraud, S Colette, Y Gallard, C Hurtaud
Spontaneous lipolysis (SL) is an enzymatic reaction which leads to a release of free fatty acids that can modify technological and sensory properties of milk and milk products. However, few studies have been done to assess the effect of feeding systems (FS) and breed on SL. Most of them were conducted in the 1980s and are not fully representative of cattle today. No previous study investigated the effect of cow breed at the whole-lactation scale. Thus, a trial was carried out to study the effects of 2 FS (high- and low-input FS) with 2 breeds [Holstein (HO) and Normande (NO)] during 1 entire lactation...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28434724/the-effect-of-presynchronization-with-prostaglandin-f2%C3%AE-and-gonadotropin-releasing-hormone-simultaneously-7-d-before-ovsynch-compared-with-presynch-10-ovsynch-on-luteal-function-and-first-service-pregnancies-per-artificial-insemination
#17
J P N Martins, M J T Acevedo, T O Cunha, C Piterini, J R Pursley
Pregnancy per artificial insemination (P/AI) following Ovsynch is optimized when cows ovulate to the first GnRH of Ovsynch. Fertility programs are designed to presynchronize cows to d 6 or 7 of the estrous cycle to increase the chances of ovulation of a first-wave dominant follicle to the first GnRH of Ovsynch. The hypothesis of this experiment was that simplification of a presynchronization program through the combination of PGF2α and GnRH on the same day, 7 d before Ovsynch, would allow for similar P/AI compared with Presynch-10...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28434723/labeling-strategies-to-overcome-the-problem-of-niche-markets-for-sustainable-milk-products-the-example-of-pasture-raised-milk
#18
S Kühl, B Gassler, A Spiller
Pasture-raised milk is gaining in importance in some European countries and in the United States. The production of pasture-raised milk is linked to higher costs, as the milk is normally collected and processed separately from conventional barn milk. This could hinder the production of sustainable milk products. We discuss alternative labeling strategies that allow the mixing of pasture-raised (sustainable) and conventional milk to reduce costs and break free from the current niche market. The lower price would allow for more pasture-raised milk to be produced and enter the mainstream market...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28434722/prediction-of-milk-fatty-acid-content-with-mid-infrared-spectroscopy-in-canadian-dairy-cattle-using-differently-distributed-model-development-sets
#19
A Fleming, F S Schenkel, J Chen, F Malchiodi, V Bonfatti, R A Ali, B Mallard, M Corredig, F Miglior
The fatty acid profile of milk is a prevailing issue due to the potential negative or positive effects of different fatty acids to human health and nutrition. Mid-infrared spectroscopy can be used to obtain predictions of otherwise costly fatty acid phenotypes in a widespread and rapid manner. The objective of this study was to evaluate the prediction of fatty acid content for the Canadian dairy cattle population from mid-infrared spectral data and to compare the results produced by altering the partial least squares (PLS) model development set used...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28434720/short-and-longer-term-effects-of-feeding-increased-metwabolizable-protein-with-or-without-an-altered-amino-acid-profile-to-dairy-cows-immediately-postpartum
#20
E G Carder, W P Weiss
The first few weeks after parturition is marked by low, but increasing feed intake and sharply increasing milk production by dairy cows. Because of low intake, the nutrient density of the diet may need to be higher during this period to support increasing milk yields. We hypothesized that feeding higher levels of metabolizable protein (MP) or a protein supplement with rumen-protected lysine and methionine during the immediate postpartum period would increase yields of milk and milk components. Fifty-six Holstein cows (21 primiparous and 35 multiparous) starting at 3 d in milk were used in a randomized block design...
April 20, 2017: Journal of Dairy Science
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