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Journal of Dairy Science

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  1. Lameness detection challenges in automated milking systems addressed with partial least squares discriminant analysis.

    Journal of Dairy Science 97(12):7476 (2014) PMID 25282423

    Lameness causes decreased animal welfare and leads to higher production costs. This study explored data from an automatic milking system (AMS) to model on-farm gait scoring from a commercial farm. A total of 88 cows were gait scored once per week, for 2 5-wk periods. Eighty variables retrieved from...
  2. Effect of preweaned dairy calf housing system on antimicrobial resistance in commensal Escherichia coli.

    Journal of Dairy Science 97(12):7633 (2014) PMID 25306277

    Group housing of preweaned dairy calves is a growing practice in the United States. The objective of this practice is to increase the average daily gain of calves in a healthy and humane environment while reducing labor requirements. However, feeding protocols, commingling of calves, and occurrence...
  3. Use of a direct-fed microbial product as a supplement during the transition period in dairy cattle.

    Journal of Dairy Science 97(11):7102 (2014) PMID 25218748

    We detected no difference between internal markers for the measurement of ATTD. In conclusion, we were unable to detect a change in overall dry matter intake, milk yield, or milk and blood parameters with DFM supplementation. However, our results demonstrated that DFM can have a positive effect on t...
  4. Short communication: a food-systems approach to assessing dairy product waste.

    Journal of Dairy Science 97(10):6107 (2014) PMID 25064645

    Concern about world population increase, food security, and the environmental burdens of food production have made food-waste reduction a social and environmental priority. In this context, the quantification of dairy product waste is especially difficult due to the varied means of disposal, by soli...
  5. Effects of abomasal infusion of conjugated linoleic acids, Sterculia foetida oil, and fish oil on production performance and the extent of f...

    Journal of Dairy Science 97(10):6411 (2014) PMID 25064649

    The purpose of this study was to determine the effects of conjugated linoleic acid (CLA), Sterculia foetida oil (STO), and fish oil (FO) on milk yield and composition, milk FA profile, Δ(9)-desaturation activity, and mammary expression of 2 isoforms of stearoyl-coenzyme A desaturase (SCD-1 and SCD-5...
  6. Effect of prepartum administration of recombinant bovine somatotropin on health and performance of lactating dairy cows.

    Journal of Dairy Science 97(10):6231 (2014) PMID 25087023

    We detected no differences in serum aspartate aminotransferase, calcium, or haptoglobin between groups. Milk yield was recorded daily for each cow for 63 d, and did not differ between groups (37.1 ± 0.5 kg and 36.7 ± 0.5 kg, respectively) but we detected a tendency for treated cows to produce 0.8 kg...
  7. Multiresidue analysis of 30 organochlorine pesticides in milk and milk powder by gel permeation chromatography-solid phase extraction-gas ch...

    Journal of Dairy Science 97(10):6016 (2014) PMID 25087035

    A method for simultaneous determination of the 30 organochlorine pesticides (OCP) in milk and milk powder samples has been developed. Prior to the gas chromatography-tandem mass spectrometric analysis, the residual OCP in samples were extracted with n-hexane and acetone mixture (1/1, vol/vol) and cl...
  8. Replacing corn silage with different forage millet silage cultivars: effects on milk yield, nutrient digestion, and ruminal fermentation of ...

    Journal of Dairy Science 97(10):6440 (2014) PMID 25108857

    This study investigated the effects of dietary replacement of corn silage (CS) with 2 cultivars of forage millet silages [i.e., regular millet (RM) and sweet millet (SM)] on milk production, apparent total-tract digestibility, and ruminal fermentation characteristics of dairy cows. Fifteen lactating...
  9. Removal of milk fat globules from whey protein concentrate 34% to prepare clear and heat-stable protein dispersions.

    Journal of Dairy Science 97(10):6097 (2014) PMID 25108870

    Whey protein concentrates (WPC) are low-cost protein ingredients, but their application in transparent ready-to-drink beverages is limited due to turbidity caused by fat globules and heat instability. In this work, fat globules were removed from WPC 34% (WPC-34) to prepare heat-stable ingredients vi...
  10. Investigation of bacterial and fungal diversity in tarag using high-throughput sequencing.

    Journal of Dairy Science 97(10):6085 (2014) PMID 25129502

    Our results revealed the presence of a total of 47 bacterial and 43 fungal genera in all tarag samples, in which Lactobacillus and Galactomyces were the predominant genera of bacteria and fungi, respectively. The number of some microbial genera, such as Lactococcus, Acetobacter, Saccharomyces, Trich...