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Journal of Dairy Research

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https://www.readbyqxmd.com/read/30560744/relationship-between-the-fatty-acid-profile-of-hair-and-energy-availability-of-lactating-primiparous-cows
#1
Ramona Möller, Dirk Dannenberger, Gerd Nürnberg, Eva-Maria Strucken, Gudrun A Brockmann
We hypothesised that a relationship would exist between hair fatty acids, especially C12:0, C14:0 and C16:0, and parameters of energy metabolism such as energy intake, energy mobilisation, and energy requirement for maintenance and milk performance. For this study, 11 primiparous German Holstein cows were available from which hair samples at weeks 6 and 8 of lactation were analysed. The average body weight of these animals was 558 ± 27 kg at calving and milk yield at 100-days in milk was 3,537 ± 529 kg. Feed intake and milk yield were measured daily...
December 18, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30526697/increased-take-off-level-in-automatic-milking-systems-effects-on-milk-flow-milk-yield-and-milking-efficiency-at-the-quarter-level
#2
Sabine Ferneborg, Måns Thulin, Sigrid Agenäs, Kerstin Svennersten-Sjaunja, Peter Krawczel, Emma Ternman
This research communication describes how different detachment levels (0.48, 0.3 and 0.06 kg milk/min) at the quarter-level affect milk flow profiles and overall milking efficiency in automatic milking systems. We hypothesized a higher detachment level would result in greater mean flow rates without affecting the volume of harvested milk per cow during 24 h compared to lower detachment levels. The data suggest milk flow decreased to a rate below the overmilking limit within the 6-s delay time required for termination in all treatments, but the duration of overmilking was shorter for the greatest detachment level compared to the other treatments...
December 11, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30520408/variable-sialic-acid-content-in-milk-of-indian-cattle-and-buffalo-across-different-stages-of-lactation
#3
Rekha Sharma, Sonika Ahlawat, Himani Sharma, R A K Aggarwal, Vivek Sharma, M S Tantia
The aim of this Research Communication was to contribute to the knowledge of milk sialic acid concentration of bovines with specific focus on India. Sialic acids (SA) are important constituents of mammalian milks. Buffaloes are the main milk producing species in India, therefore, our research focused on both cow and buffalo. Two Indian cattle (Bos indicus) breeds (Sahiwal, Tharparkar), one cross bred cattle - Karan Fries (Tharparkar × Holstein Friesian) and a buffalo breed (Murrah) were selected. Systematic comparisons of the total, free and bound form of SA and also its distribution over the course of lactation- colostrums and mature milk (120-140 d) was generated...
December 6, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30520398/appropriate-selection-indices-for-functional-traits-in-dairy-cattle-breeding-schemes
#4
Arash Chegini, Navid Ghavi Hossein-Zadeh, Seyed Hossein Hosseini Moghaddam, Abdol Ahad Shadparvar
The objective of this study was to establish different single or multiple trait selection indices to calculate genetic and economic gains by combining some production, reproduction and udder health traits in a population similar to the overall practical situation in Iran, with and without imposing restrictions on genetic change for some traits. The SelAction software was used to perform the analyses based on selection index theory through a deterministic model. Results indicated that among established indices, the index that showed the highest genetic gain for milk yield did not maximize the total genetic and economic gains...
December 6, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30520392/the-dynamics-of-individual-whey-protein-concentrations-in-cows-mammary-secretions-during-the-colostral-and-early-lactation-periods
#5
Raquel F S Raimondo, Juliana S P Ferrão, Samantha I Miyashiro, Priscila T Ferreira, João Paulo E Saut, Daniela B Birgel, Eduardo H Birgel Junior
The bovine whey consists of more than 200 different types of proteins, of which β-lactoglobulin, α-lactalbumin, serum albumin, immunoglobulins and lactoferrin predominate. However, their concentrations are not stable due to the existence of protein dynamics during a transition from colostrum secretion to mature milk. To evaluate the dynamics of whey proteins of Jersey cows during a colostral phase and first month of lactation and an influence of the number of lactations, 268 milk samples from 135 Jersey cows were selected through a clinical evaluation...
December 6, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30520391/thermal-effects-on-igm-milk-fat-globule-mediated-agglutination
#6
Steffen F Hansen, Lotte B Larsen, Lars Wiking
The process of agglutination causes firm cream layers in bovine milk, and a functioning agglutination mechanism is paramount to the quality of non-homogenized milks. The phenomenon is not well-described, but it is believed to occur due to interactions between immunoglobulins (Ig) and milk fat globules. For the first time, this paper demonstrates how the process of agglutination can be visualized using confocal laser scanning microscopy, rhodamine red and a fluoresceinisothiocynat-conjugated immunoglobulin M antibody...
December 6, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30420002/use-of-single-step-genome-wide-association-studies-for-prospecting-genomic-regions-related-to-milk-production-and-milk-quality-of-buffalo
#7
Camila da Costa Barros, Daniel Jordan de Abreu Santos, Rusbel Raul Aspilcueta-Borquis, Gregório Miguel Ferreira de Camargo, Francisco Ribeiro de Araújo Neto, Humberto Tonhati
The aim of this research communication was to identify chromosome regions and genes that could be related to milk yield (MY), milk fat (%F) and protein percentage (%P) in Brazilian buffalo cows using information from genotyped and non-genotyped animals. We used the 90 K Axiom® Buffalo Genotyping array. A repeatability model was used. An iterative process was performed to calculate the weights of markers as a function of the squared effects of Single Nucleotide Polymorphism (SNP) and allele frequencies. The 10 SNPs with the largest effects for MY, %F and %P were studied and they explained 7·48, 9·94 and 6·56% of the genetic variance, respectively...
November 13, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30419970/editorial-everyone-must-see-what-is-in-pandora-s-box
#8
Christopher H Knight
No abstract text is available yet for this article.
November 13, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30444209/the-potential-use-of-probiotic-and-beneficial-bacteria-in-the-brazilian-dairy-industry
#9
Monique Colombo, Svetoslav Dimitrov Todorov, Monique Eller, Luís Augusto Nero
Scientific studies demonstrate the importance of intestinal microbiota to human health and how probiotic microorganisms can positively affect health when administered regularly and in adequate amounts. Probiotic bacteria can be part of fermented products and their functional importance is associated mainly with their metabolism. They are thought to benefit individuals to maintain their health and also to strengthen resistance against various types of diseases. The acceptance of probiotic cultures and products by consumers increased when these bacteria were marketed as natural cultures that help in digestion and health...
November 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30295210/ultrasonographic-measurement-of-liver-portal-vein-hepatic-vein-and-perivisceral-adipose-tissue-in-high-yielding-dairy-cows-with-fatty-liver-during-the-transition-period
#10
Enrico Fiore, Laura Perillo, Massimo Morgante, Elisabetta Giudice, Barbara Contiero, Giulio Curone, Elisabetta Manuali, Silvia Pavone, Giuseppe Piccione, Matteo Gianesella
The aim of the present study was to evaluate the potential for diagnosis of fatty liver by means of ultrasonographic measurement of liver and perivisceral adipose tissue as an alternative to blood indicators of lipomobilization and liver biopsy in periparturient high-yielding dairy cows. Thirty cows were enrolled and divided into two groups. The evaluation of body condition score (BCS), non-esterified fatty acids (NEFA), β-hydroxybutyrate (BHB), liver and perivisceral adipose tissue ultrasonographic measurement and histological liver lipid content (GdL) was performed at 15 ± 5 d prepartum (T0), 10 ± 2 d postpartum (T1), 30 ± 2 d postpartum (T2) and 50 ± 2 d postpartum (T3)...
October 8, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30236165/effects-of-chronic-heat-stress-on-lactational-performance-and-the-transcriptomic-profile-of-blood-cells-in-lactating-dairy-goats
#11
Alexandra Contreras-Jodar, Ahmed Ak Salama, Soufiane Hamzaoui, Mario Vailati-Riboni, Gerardo Caja, Juan J Loor
High temperature is a major stress that negatively affects welfare, health, and productivity of dairy animals. Heat-stressed animals are more prone to disease, suggesting that their immunity is hindered. Although productive and physiologic responses of dairy animals to heat stress are well known, there is still limited information on the response at the transcriptome level. Our objective was to evaluate the changes in performance and blood transcriptomics of dairy goats under heat stress. Eight multiparous Murciano-Granadina dairy goats in mid-lactation were assigned to 1 of 2 climatic treatments for 35 d...
September 21, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30157973/effects-of-polymerized-whey-protein-on-goaty-flavor-and-texture-properties-of-fermented-goat-milk-in-comparison-with-%C3%AE-cyclodextrin
#12
Ce Wang, Cuina Wang, Feng Gao, Yanyang Xu, Mingruo Guo
Goaty flavor and poor consistency may impact consumer acceptance of fermented goat milk. The undesirable characteristics can mainly be attributed to the presence of short-medium chain free fatty acid (SM-FFA) especially C6-C10 fatty acids and low αs1-casein content in goat milk. This study aimed to investigate the effects of polymerized whey protein (PWP) on goaty flavor as well as the texture properties of fermented goat milk in comparison with β-cyclodextrin (β-CD). Samples were evaluated on sensory properties, SM-FFA contents, texture, and apparent viscosity...
August 30, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30152301/quantitation-of-viable-coxiella-burnetii-in-milk-products-using-a-liquid-medium-based-mpn-pcr-assay
#13
Manman Shi, Cheng Zhang, Diana Stewart
This Technical Research Communication describes a new method by which thermally treated Coxiella in milk products may be grown in a liquid growth medium and quantitated using an MPN-PCR assay. Coxiella is generally not used in studies on thermal and non-thermal processing of milk due to the need for specialized and highly laborious techniques such as animal assays and tissue culture for determining viability. Recently, a liquid growth medium (ACCM-2) and modified atmosphere were used to grow Coxiella from pure cultures, infected mouse tissues, and clinical samples, however, the ability to grow Coxiella from a food such as milk has not been shown...
August 28, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30136638/lactoperoxidase-immobilization-on-silver-nanoparticles-enhances-its-antimicrobial-activity
#14
Ishfaq Ahmad Sheikh, Muhammad Yasir, Imran Khan, Sher Bahadur Khan, Naveed Azum, Essam Hussain Jiffri, Mohammad Amjad Kamal, Ghulam Md Ashraf, Mohd Amin Beg
Lactoperoxidase (LPO) is an antimicrobial protein present in milk that plays an important role in natural defence mechanisms during neonatal and adult life. The antimicrobial activity of LPO has been commercially adapted for increasing the shelf life of dairy products. Immobilization of LPO on silver nanoparticles (AgNPs) is a promising way to enhance the antimicrobial activity of LPO. In the current study, LPO was immobilized on AgNPs to form LPO/AgNP conjugate. The immobilized LPO/AgNP conjugate was characterized by various biophysical techniques...
August 23, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30132435/effects-of-pasteurization-and-storage-conditions-on-donkey-milk-nutritional-and-hygienic-characteristics
#15
Mina Martini, Federica Salari, Iolanda Altomonte, Giuseppe Ragona, Alice Piazza, Roberta Gori, Daniela Casati, Giovanni Brajon
Until now there are only few data on the effects of thermal treatments on the nutritional and hygienic characteristics of donkey milk. This Research Communication aims to provide information on the effects of pasteurization (at +65 °C for 30 min) and prolonged storage at refrigeration and freezing temperatures (21 d at + 3 °C ± 2 °C and up to 90 d at -20 °C ± 5 °C) on some nutritional and hygienic characteristics of Amiata donkey milk. The milk was monitored by chemical and microbiological analysis. Pasteurization ensured compliance with EC Regulation No 1441/2007, as Enterobacteriaceae were never found in the milk, or during storage at refrigeration and freezing temperatures...
August 22, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30132424/high-throughput-ph-monitoring-method-for-application-in-dairy-fermentations
#16
Valery Gutsal, Sander Sieuwerts, Rodrigo Bibiloni
Optimization of dairy fermentation processes often requires multiplexed pH measurements over several hours. The method developed here measures up to 90 samples simultaneously, where traditional electrode-based methods require a lot more time for handing the same number of samples. Moreover, the new method employs commonly used materials and can be used with a wider range of fluorescence readers than commercial 96-well plates with optical pH sensors. For this application, a milk-like transparent medium is developed that shows acidification properties with dairy starters that are similar to milk...
August 22, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30132421/changes-occurring-in-stabilized-ultra-high-temperature-treated-whole-milk-during-storage
#17
Fernando César Dos Santos, Fabiano Érisson da Cunha, Érika de Pádua Alves, Flávia de Almeida Bergonse Pereira, Elsa Helena Walter de Santana, Bruno Garcia Botaro
This Research Communication describes the relationship between casein, free fatty acids (FFAs) and the storage period of ultra-high temperature-treated (UHT) whole milk observed for a period of 120 d of labelled shelf-life. Moreover, we aim to estimate the daily rate of casein degradation in UHT whole milk, and the total length of time estimated for its full degradation. With this aim, ten sets of samples were evaluated from batches of UHT milk manufactured by a dairy processing plant in Parana State, Brazil on 10 different days...
August 22, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30101732/effect-of-fermentation-temperature-and-different-streptococcus-thermophilus-to-lactobacillus-bulgaricus-ratios-on-kermanshahi-roghan-and-yoghurt-fatty-acid-profiles
#18
Ali Mostafaie, Gholamreza Bahrami, Maryam Chalabi
The objective of the study reported in this Research Communication was to investigate the effect of fermentation temperature (37 and 45 °C) and different ratios of Streptococcus thermophilus to Lactobacillus bulgaricus (3 : 1, 1 : 1 and 1 : 3) on Kermanshahi roghan and yoghurt fatty acid profiles (FAP) in order to obtain a product with optimized fatty acid profiles. Kermanshahi roghan is a yoghurt by-product in western Iran (Kermanshah). The results revealed that incubation temperature at 37 °C as compared to 45 °C had a better effect on fatty acid profiles of roghan and yoghurt...
August 13, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30088471/toll-like-receptor-4-gene-polymorphisms-influence-milk-production-traits-in-chinese-holstein-cows
#19
Mengqi Wang, Hailiang Song, Xiaorui Zhu, Shiyu Xing, Meirong Zhang, Huimin Zhang, Xiaolong Wang, Zhangping Yang, Xiangdong Ding, Niel A Karrow, Sven König, Yongjiang Mao
The research reported in this Research Communication aimed to describe the influence of Toll-like receptor 4 gene polymorphisms on milk production traits in Chinese Holstein cows. Toll-like receptor 4 (TLR4) is an important member of the toll-like receptor gene family that is widely found in various organisms. Since TLR4 can identify molecular patterns from various pathogenic microorganisms and induce natural and acquired immunity, it plays an important role in disease resistance in dairy cows. Two single nucleotide polymorphisms (SNPs) of TLR4 (c...
August 8, 2018: Journal of Dairy Research
https://www.readbyqxmd.com/read/30088470/lps-induced-reduction-of-triglyceride-synthesis-and-secretion-in-dairy-cow-mammary-epithelial-cells-via-decreased-srebp1-expression-and-activity
#20
Jianfa Wang, Xu Zhang, Xianjing He, Bin Yang, Hai Wang, Xufei Shan, Chunqiu Li, Dongbo Sun, Rui Wu
Sterol regulatory element binding protein 1 (SREBP1) has a central regulatory effect on milk fat synthesis. Lipopolysaccharides (LPS) can induce mastitis and cause milk fat depression in cows. SREBP1 is also known to be associated with inflammatory regulation. Thus, in the current study, we hypothesized that LPS-induced milk fat depression in dairy cow mammary epithelial cells (DCMECs) operates via decreased SREBP1 expression and activity. To examine the hypothesis, DCMECs were isolated and purified from dairy cow mammary tissue and treated with LPS (10 µg/ml)...
August 8, 2018: Journal of Dairy Research
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