Journal of Dairy Science back issues from March 2006:
Response to "Letter to the Editor: Comments on a Recent Article by Burgos et al."
Mar 01, 2006; ... We wish to respond to the letter by Shryock et al. (2005) regarding our paper (Burgos et al., 2005). Their comments were, regrettably, inaccurate. First, Shryock and colleagues contended that we tested chloramphenicol, nalidixic acid, tetracycline, and penicillin because of their widespread use ...
Proteolysis of Hispánico Cheese Manufactured Using Lacticin 481-Producing Lactococcus lactis ssp. lactis INIA 639
Mar 01, 2006; ... ABSTRACT Hispánico cheese was manufactured using lacticin 48!-producing Lactococcus lactis ssp. lactis INIA 639, bacteriocin-nonproducing L. lactis ssp. lactis INIA 437, or a combination of both strains, as starter cultures. Lactobacillus helveticus LH 92, a culture of high ...
Altering Renneting pH Changes Microstructure, Cell Distribution, and Lysis of Lactococcus lactis AM2 in Cheese Made from Ultrafiltered Milk
Mar 01, 2006; ... ABSTRACT The objective of this study was to investigate the lysis of a highly autolytic strain of Lactococcus lactis ssp. cremoris AM2 in a model cheese made from concentrated ultrafiltered milk. From the same initial ultrafiltered retentate inoculated with L. lactis AM2, 5 cheeses were ...
Technical Note: Determination of Acidity in Whole Raw Milk: Comparison of Results Obtained by Two Different Analytical Methods
Mar 01, 2006; ... ABSTRACT In Argentina, one analytical method is usually carried out to determine acidity in whole raw milk: the Instituto Nacional de Racionalizacion de Materiales standard (no. 14005), based on the Domic method of French origin. In a national and international regulation, the ...
Correlation Between Multielement Stable Isotope Ratio and Geographical Origin in Peretta Cows' Milk Cheese
Mar 01, 2006; ... ABSTRACT The aim of this study was to characterize the isotopic composition and protect "Peretta" cows' milk cheese, a typical product of Sardinia, against other cheeses of the same appearance sold under the same name, but made of raw materials from northern Europe. The study was ...
Short Communication: Inactivation of Microbial Contaminants in Raw Milk La Serena Cheese by High-Pressure Treatments
Mar 01, 2006; ... ABSTRACT La Serena cheese, a Spanish variety made from Merino ewes' raw milk, has a high pH value, low salt content, and high moisture, conditions that are all favorable for growth and survival of contaminating microorganisms, including pathogens. To improve its microbiological quality ...
Continuous Flow Nonthermal CO2 Processing: The Lethal Effects of Subcritical and Supercritical CO2 on Total Microbial Populations and Bacterial Spores in Raw Milk
Mar 01, 2006; ... ABSTRACT The effect of pressurized (<50 MPa) CO2 as a nonthermal process for bacterial reduction in raw skim milk was examined using a unique pressurized continuous flow system. The lethal effects of subcritical and supercritical CO2 applied at different temperatures and pressures ...
Improving Farm Management by Modeling the Contamination of Farm Tank Milk with Butyric Acid Bacteria
Mar 01, 2006; ... ABSTRACT Control of contamination of farm tank milk (FTM) with the spore-forming butyric acid bacteria (BAB) is important to prevent the late-blowing defect in semihard cheeses. The risk of late blowing can be decreased via control of the contamination level of FTM with BAB. A modeling ...
Comparative Study on Shelf Life of Whole Milk Processed by High-Intensity Pulsed Electric Field or Heat Treatment
Mar 01, 2006; ... ABSTRACT The effect of high-intensity pulsed electric fields (HIPEF) processing (35.5 kV/cm for 1,000 or 300 µ8 with bipolar 7-µs pulses at 111 Hz; the temperature outside the chamber was always <40°C) on microbial shelf life and quality-related parameters of whole milk were ...
Influence of Proteins on the Perception of Flavored Stirred Yogurts
Mar 01, 2006; ... ABSTRACT Among yogurt dairy components, protein type is known to modify the texture of the products and the volatility of odorous volatile organic compounds. The aim of this study was to investigate the impact of 3 protein ratios (caseinate to total protein) on the sensory properties of ...
Effects of Frozen and Refrigerated Storage on Organic Acid Profiles of Goat Milk Plain Soft and Monterey Jack Cheeses
Mar 01, 2006; ... ABSTRACT The effects of 6 mo of freezing and refrigeration on organic acid profiles of 2 types of goat milk cheese [plain soft (PS) and Monterey Jack (MJ)] were studied in comparison with those of a nonfrozen control (NFC). Three lots of commercial PS cheeses were purchased, and 3 lots ...
Influence of Calcium and Phosphorus, Lactose, and Salt-to-Moisture Ratio on Cheddar Cheese Quality: pH Buffering Properties of Cheese
Mar 01, 2006; ... ABSTRACT The pH buffering capacity of cheese is an important determinant of cheese pH. However, the effects of different constituents of cheese on its pH buffering capacity have not been fully clarified. The objective of this study was to characterize the chemical species and chemical ...
Environmental Sampling for Detection of Mycobacterium avium ssp. paratuberculosis on Large California Dairies
Mar 01, 2006; ... ABSTRACT Environmental samples collected from each of 3 locations on 23 large California dairies were cultured to evaluate the utility of this approach for identifying herds infected with Mycobacterium avium ssp. paratuberculosis. Results were compared with concurrent ELISA testing of ...
Triacylglycerol Composition of Protected Designation of Origin Cheeses During Ripening. Authenticity of Milk Fat
Mar 01, 2006; ... ABSTRACT Triacylglycerol (TAG) composition by carbon number in 2 protected designation of origin cheeses, Mahón (cheese from cow milk) and Manchego (cheese from ewe milk) that were manufactured by 3 different producers was analyzed during cheese ripening using gas chromatography with a ...
A Model System for Studying the Effects of Colloidal Calcium Phosphate Concentration on the Rheological Properties of Cheddar Cheese
Mar 01, 2006; ... ABSTRACT A novel model system was developed for studying the effects of colloidal Ca phosphate (CCP) concentration on the rheological properties of Cheddar cheese, independent of proteolysis and any gross compositional variation. Cheddar cheese slices (disks; diameter = 50 mm, thickness ...
Relationships Between Somatic Cell Count and Intramammary Infection in Buffaloes
Mar 01, 2006; ... ABSTRACT The objectives of this study were to evaluate the presence of intramammary infections (IMI) in dairy buffaloes and to examine the relationships among IMI, somatic cell counts (SCC), and milk production traits. Two farms in northern Italy were visited monthly for a complete ...
Sources of Variation in Milk Flow Characteristics at Udder and Quarter Levels
Mar 01, 2006; ... ABSTRACT The aim of this study was to describe and analyze effects of parity, stage of lactation, milkability (3 groups of cows with differing peak flow rates), time of milking, and quarter position on milk production and milk flow measures at udder and quarter levels. Particular ...
Comparison of Ion-Specific Electrode and High Performance Liquid Chromatography Methods for the Determination of Iodide in Milk1
Mar 01, 2006; ... ABSTRACT Two methods for the determination of I- in raw and processed milk were examined. A simple ion-specific electrode (ISE) method was compared against a more complex HPLC reference technique. Accuracy and precision were evaluated both within and between the 2 methods. Both methods ...
Technical Note: A Method to Facilitate Retrieval of Polyester Bags Used in In Sacco Trials in Ruminants
Mar 01, 2006; ... ABSTRACT A method is described to facilitate the retrieval of polyester bags from ruminally cannulated cattle. The system consists of 2 major components, i) an accommodation vessel for multiple polyester bags in the form of an opaque nylon stocking, referred to as the "receptacle," and ...
Rheological Behavior and Organoleptic Effects of Ovalbumin Addition in Yogurt Mousse Production
Mar 01, 2006; ... ABSTRACT Yogurt mousse is a novel, high added-value dairy product that has been well received by the market. This paper presents a study of the effect of the addition of ovalbumin to the product on its rheological and organoleptic qualities. The ovalbumin was previously separated from ...
Milk Culture Results in a Large Norwegian Survey-Effects of Season, Parity, Days in Milk, Resistance, and Clustering
Mar 01, 2006; ... ABSTRACT A nationwide random computerized assignment survey that included 3,538 sets of 4 quarter milk samples from 2,834 dairy cows was conducted during 2000. Every fifth cow from every 50th herd was randomly selected for sampling and culture during each quarter of the year. Milk ...
Augmentation of Vaccenate Production and Suppression of Vaccenate Biohydrogenation in Cultures of Mixed Ruminal Microbes
Mar 01, 2006; ... ABSTRACT To increase ruminal outflow of trans-vaccenic acid (t-VA), a new strain of Butyrivibrio fibrisolvens (MDT-10) was isolated that has a great ability to hydrogenate linoleic acid (LA) to t-VA. When strain MDT-10 was added to the batch cultures of mixed ruminal microbes (1% of the ...
Comparison of Antibiotic Resistance of Udder Pathogens in Dairy Cows Kept on Organic and on Conventional Farms
Mar 01, 2006; ... ABSTRACT There has been a rapid rise in the emergence of multidrug-resistant pathogens in the past 10 to 15 yr and some bacteria are now resistant to most antimicrobial agents. Antibiotic use is very restricted on Swiss organic dairy farms, and a purely prophylactic use, such as for dry ...
Dry Matter Intake and Blood Parameters of Nonlactating Holstein and Jersey Cows in Late Gestation
Mar 01, 2006; ... ABSTRACT An experiment was conducted using 14 multiparous Holstein and 14 multiparous Jersey cows to determine if dry matter intake (DMI), specifically the decline in prepartum DMI and plasma parameters differed between breeds. Cows were blocked by expected calving date and received a ...
Impact of Milking Frequencies on the Level of Free Fatty Acids in Milk, Fat Globule Size, and Fatty Acid Composition
Mar 01, 2006; ... ABSTRACT The aim of the present study was to study the effect of milking cows 4 times daily on free fatty acids (FFA) in the milk compared with milking twice daily. An experiment was performed during 2 wk in which half udders in 11 cows were milked 2 or 4 times daily. Milk yield was ...
Absorption of 2-Hydroxy-4-Methylthiobutyrate and Conversion to Methionine in Lambs
Mar 01, 2006; ... ABSTRACT Absorption and metabolism of the Met hydroxy analog 2-hydroxy-4-methylthiobutyrate (HMTBA) was examined using stable isotopes. In the first trial, DL[1-^sup 13^C]HMTBA was infused for 6 h (7.4 µmol/min) into the abomasum, and [^sup 2^H^sub 3^]Met was infused into the mesenteric ...
Short Communication: A Potential Antiapoptotic Phenotype in Neutrophils of Cows Milked Once Daily in Early Lactation
Mar 01, 2006; ... ABSTRACT The objectives of this experiment were to compare the circulating concentrations of cortisol and determine whether these correlated with the expression profiles of a set of candidate apoptosis genes in neutrophils of Holstein-Friesian cows milked once vs. 3 times daily for 28 d ...
Effects of Fatty Acid Supplements on Ruminal and Total Tract Nutrient Digestion in Lactating Dairy Cows
Mar 01, 2006; ... ABSTRACT Saturated and unsaturated fatty acid supplements (FS) were evaluated for effects on ruminai digestion kinetics, and ruminai and postruminal nutrient digestion. Eight early lactation ruminally and duodenally cannulated cows (77 ± 12 days in milk, mean ± SD) were used in a ...
Short Communication: Cultivation of Lentinus edodes Mycelia Using Whey Permeate as an Alternative Growth Substrate
Mar 01, 2006; ... ABSTRACT The major objective of this research was to use whey permeate as an alternative growth medium for the cultivation of mycelia of the edible mushroom Lentinus edodes and to find an optimum condition for solid-state cultivation. Response surface analysis was applied to determine ...
Effects of Dairy Cow Genotype with Two Planes of Nutrition on Energy Partitioning Between Milk and Body Tissue
Mar 01, 2006; ... ABSTRACT The data used in the present study were derived from a 2 (genotype) × 2 (plane of nutrition) factorial design production study using Holstein-Friesian (n = 32) and Norwegian (n = 32) first-lactation dairy cattle offered grass silage-based diets from 1 to 44 wk of lactation. The ...
Short Communication: Further Validation of the Fat Sub-Model in the Cornell-Penn-Miner Dairy Model
Mar 01, 2006; ... ABSTRACT Recently, a fat sub-model was introduced into the Cornell-Penn-Miner Dairy model (CPM-Dairy; Moate et al., 2004). The principal aim of the work reported here was to validate this fat sub-model in terms of its accuracy in predicting the apparent absorption (intake - feces) of ...
Hepatic Metabolism of 2-Hydroxy-4-Methylthiobutyrate in Growing Lambs
Mar 01, 2006; ... ABSTRACT This study was undertaken to determine how, and where, 2-hydroxy-4-methylthiobutyrate (HMTBA) can augment Met metabolism in lambs. Four lambs (initial body weight of 50 kg, SE = 2, and 6 mo of age) prepared with catheters in the mesenteric, portal, hepatic, and jugular veins ...
Effects of Fatty Acid Supplements on Milk Yield and Energy Balance of Lactating Dairy Cows
Mar 01, 2006; ... ABSTRACT Saturated and unsaturated fatty acid supplements (FS) were evaluated for effects on yield of milk and milk components, concentration of milk components including milk fatty acid profile, and energy balance. Eight ruminally and duodenally cannulated cows and 8 noncannulated cows ...
Effects of Fatty Acid Supplements on Feed Intake, and Feeding and Chewing Behavior of Lactating Dairy Cows
Mar 01, 2006; ... ABSTRACT Saturated and unsaturated fatty acid supplements (FS) were evaluated for effects on feed intake, meal patterns, and chewing behavior. Eight ruminally and duodenally cannulated cows were used in a replicated 4 × 4 Latin square design experiment with 21-d periods. Treatments were ...
Relationships Between Selected Human Resource Management Practices and Dairy Farm Performance
Mar 01, 2006; ... ABSTRACT The objectives were to identify relationships between human resource management (HRM) practices used by dairy farm businesses and the productivity and profitability of the dairies. Explanatory variables were the following practices: training, job descriptions, standard operating ...
NEWS AND EVENTS
Mar 01, 2006; ... Positions Available. . . * Assistant Professor. Assistant Professor in Dairy Cattle Management, Animal Nutrition, Department of Animal and Food Science, University of WisconsinRiver Falls. Tenure-track undergraduate faculty position at the rank of assistant professor in the Department of ...
A Novel Conformation-Dependent Monoclonal Antibody Specific to the Native Structure of [beta]-Lactoglobulin and Its Application
Mar 01, 2006; ... ABSTRACT Molten globules are thought to be general intermediates in protein folding and unfolding. β-lactoglobulin (β-LG) is one of the major bovine whey proteins, constituting -10 to 15% of total milk proteins. We have recently identified β-LG as a superior marker for ...
Differential Effects of n-3 and n-6 Fatty Acids on Prostaglandin F^sub 2[alpha]^ Production by Bovine Endometrial Cells1
Mar 01, 2006; ... ABSTRACT Recent studies have implicated n-3 polyunsaturated fatty acids in the reduction of eicosanoid production in the bovine uterus. The objective of this study was to determine whether the effect of eicosapentaenoic acid (EPA; C^sub 20:5^, n-3) on PGF^sub 2α^ production by ...
Immunogenicity of [kappa]-Casein and Glycomacropeptide
Mar 01, 2006; ... ABSTRACT Glycomacropeptide (GMP), arising from the cleavage of κ-casein by chymosin or pepsin, has been correlated with a wide variety of biological activities including immunosuppression capacity, inhibition of pathogen invasion, and induction of satiety. Due to the interest in ...