Showing papers in "Journal of Dairy Science in 1971"

TL;DR: It appears unrealistic to relate tissue energy changes to live weight change without some consideration being given to the change in rumen fill, but data from this laboratory suggest that milk may be produced from body tissue reserves with an efficiency of 82 to 84% and that theBody tissue reserves may be replenished in late lactation by deposition of body tissue with a efficiency equal to or exceeding that of milk production.

TL;DR: The specific activitytime curve of 14 -C activity in milk fat was resolved by curve analysis into two components, a rapid-turnover component attributed to exogenous (dietary) fatty acid and a slower turnover components attributed to adipose tissue.

TL;DR: The results coupled with previous studies indicate the change in the molar ratio of rumen volatile fatty acids for cows fed a high-grain, low-fiber diet is the result of an increase in propionate production rather than a decrease in acetate production.

TL;DR: In this article, the adequacy of describing results by the log normal distribution was investigated, and the results showed that the distribution yielded a good practical description in all cases, and that the variance of the variance was less than 14% for mean particle size.

TL;DR: In this paper, the authors investigated the first-order digestion kinetics for six forages, including rye, alfalfa, orehardgrass, timothy, and oats.

TL;DR: An insufficient mobilization or supply of precursors for the production of oxaloacetate and eventually glucose, relative to the animal's increased needs, thus may be the critical phase of the disorder.

TL;DR: In this article, the authors measured the taste thresholds at 50% detection of 10 of the more prevalent naturally occurring γ - and δ -lactones were measured in water and compared with those of homologous series of ethyl esters, methyl ketones, free fatty acids, aldehydes, and alcohols.

TL;DR: Urea has been used as a protein replacement for ruminants for almost a century as discussed by the authors, and it has been known that ruminant animals have the unique ability to convert nonprotein nitrogen (NPN) to protein.

TL;DR: In this article, molecular complex formation between anionic hydrocolloids and proteins was used to recover proteins from whey with carboxymethylcellulose, and the resulting complex was removed by centrifugation.

TL;DR: Enterotoxin A production by Staphylococcus aureus in Cheddar and Colby cheeses was determined by inoculating milk with different initial S. a Aureus populations and making cheese using normal and inhibited starter cultures.

TL;DR: Over 18% of cows returning to service within 49 days of first insemination were remated within the first 17 days, and the incidence of these cycles increased with increasing herd size and was most common among second calving 3 year-old cows.

TL;DR: It was estimated that 45% of Ig ingested immediately after birth and at 12 hours was absorbed prior to 24 hours, and approximately 68% of the variation in blood serum Ig in calves at 24 hours could be attributed to differences in Ig consumed per unit of weight.

TL;DR: Infant formula foods, such as evaporated milk, modified milk, and formulas containing lamb meat and soya flour, were collected quarterly from the Cincinnati, Ohio, market and trace elements, including Cd, Cu, Fe, Pb, Mn, and Zn were analyzed.

TL;DR: Oxytocin is not responsible for release of prolactin from the anterior pituitary, and it is found that milking caused a 4.8-fold increase in serum Prolactin in some of the same cows that failed to release prol actin after an oxytocin injection.

TL;DR: In this article, a simple, rapid, and reproducible method was developed for the isolation of bitter and astringent flavor components from Cheddar cheese, which was extracted with 2:1 (v:v) ehloroform-methanol.

TL;DR: The ability of nitrate to alter ruminal fermentation by acting as an alternate electron acceptor was investigated in this paper, where sodium and potassium nitrate were either incorporated into the concentrate portion of a high grain ration fed to a nonlactating Jersey cow or were infused intraruminally in progressively larger amounts until nitrate (NO- 3 ) intake equaled 5 to 6% of total feed intake.

TL;DR: Modified Ham's F10 and TCM 199, each with 1.5% bovine serum albumin, were used to culture superovulated ova from pre- and postpuberal heifers, suggesting that the reproductive tract of the immature animal may be harmful to ova.

TL;DR: In vitro and in vivo rumen fermentation studies and a lamb performance trial indicate that methane inhibitors significantly alter ruminal metabolism resulting in a potentially favorable shift in the proportions of useful metabolites produced in the rumen.

TL;DR: Although there is no known preventive procedure which would guarantee freedom from ketosis, the following specific suggestions are made: 1) Avoid excessive fatness at calving, and 2) increase concentrate feeding to moderate levels in the late dry period and rapidly after calve, using care to prevent the cow from going off feed.

TL;DR: The effects of inhibitors indicate that this clotting enzyme is not metal dependent and does not have serine or SH active groups, and the enzyme is most stable at acid pH.

TL;DR: In dairy cows 28 months to 15 years of age, relationships between body components and body weight were quite variable, reflecting the mobility of body fat, water, and protein, and general trends such as the overall rate of change of 4.38 Meal, of energy per kilogram of empty-body weight are suggested.

TL;DR: In this paper, corn silages (34 to 37% dry matter) ensiled with no additive were fed as the only forage to lactating cows averaging 29.3kg milk per day when treatment began.

TL;DR: In this article, a partial fractionation of carboxymethylcellulose/protein complexes was achieved by selected conditions of pH, ionic strength, and ratio of CARC to protein.

TL;DR: In this paper, the maximum acetaldehyde levels of three commercial yogurt cultures were determined during seven hours of incubation at 45C and during four weeks of storage at 4C, and all three cultures produced maximum levels of 22 to 26ppm at the fifth hour and declined thereafter.

TL;DR: The results suggest that changing estrogen and progesterone the last 4 to 6 weeks of pregnancy, either directly or indirectly, exert a controlling influence on the selective transport of IgG1 to bovine lacteal fluid and, thus, colostrum formation.

TL;DR: Compositional analyses of milk fat globule membrane revealed that it differs from plasma membranes chiefly in that it contains higher levels of neutral lipids, particularly triglycerides.

TL;DR: Differences in glucose kinetics between fasting ketosis and spontaneous ketosis suggest the desirability of distinguishing between different types of ketosis for designing and testing control measures.

TL;DR: The results suggest that lactoferrin, as it exists in whole whey, is in the form of a complex which is broken down by ion-exchange chromatography.

TL;DR: Soybean concentrate, when included in the diets of suckling calves, should be properly heated and diminished markedly the incidence and severity of diarrhea.

TL;DR: Growth inhibition of S. aureus in raw milks may or may not always result in simultaneous inhibition of enterotoxin A production, and the influences of the initial bacterial count and heat treatment of raw whole milk and the initial pH of sterile reconstituted nonfat dry milk on growth and enterot toxin A production were evaluated.