Showing papers in "Journal of Dairy Science in 1959"

TL;DR: In this article, 12 young dairy calves equipped with rumen cannulae were fed milk and housed in tie stalls with elevated floors to prevent bedding consumption, to study their effect on rumen mucosal development.

TL;DR: In this article, a quantitative method for determining 5-hydroxymethylfurfural (HMF) by spectrophotometric measurement if the 2-thiobarbituric acid (TBA) reaction product is used.

TL;DR: Oxytocin was less effective in causing diestrual shortening when either atropine or reserpine was administered concurrently, and was completely ineffective in inducing precocious estrus in hysterectomized, but not in sham-operated, heifers.

TL;DR: In this paper, a method for estimating the degree of proteolysis in ripening cheese was studied by measuring absorption of ultraviolet light by a clear, sodium citrate-hydrochloric acid extract of cheese at pH 4.4±0.05; these measurements were closely correlated with the per cent of soluble nitrogen in the cheese extract.

TL;DR: The mean duration of estrus for 1,460 estrous periods for 270 cows and heifers was 11.9 hr., with heifer having significantly longer estrous period than parous cows, and monthly PBI levels were inversely related to environmental temperature and humidity.

TL;DR: The results indicate the relatively great ability of B. succinogenes to synthesize cellular constituents and, also, how well this bacterium is adapted to the environment of the rumen.

TL;DR: In this article, an analysis of ultrafiltrates collected from milk at temperatures up to 230° F indicated that temperature changes affect the inorganic composition of milk much more drastically than has previously been demonstrated from the analyses of cooled milks.

TL;DR: A relatively simple modification of the method for fractionating whole casein in urea solutions is described in this paper, which gives a calcium-sensitive α-casein and α-paracasein.

TL;DR: For example, this article found that cows on dry feed were drenched with large (10-g) doses of copper sulfate, and there was an increase in the natural copper content of their milk and in the incidence and intensity of spontaneous oxidized flavor.

TL;DR: In this paper, a mechanism of milkfat depression based on the antiketogenic properties of propionic acid is discussed, and an hypothesis regarding a mechanism for milk-fat depression is discussed.

TL;DR: Dairy heifers should be bred as soon as large enough to minimize possible harmful effects on length of productive life and Correcting production for weight should be based only on the environmental part of the relationship between weight and production to avoid removing some genetic variation in production.

TL;DR: In this article, a radioactive tracer was used to determine the distribution of copper in milk, and the results showed that naturally occurring copper was concentrated at the surface of fat globules; whereas, most of the added copper was uniformly associated with the skimmilk proteins.

TL;DR: The results of this experiment indicate that daily ejaculation of aged bulls for as long as 8 mo. is not harmful, either to the bulls themselves or to the quality of the sperm they produce.

TL;DR: The establishment of adult-type organisms and cellulose digestion were slowest to develop and were hindered by aureomycin and liberal milk feeding, with an indication of synthesis early in life.

TL;DR: Out of 7,387 calvings in a Holstein-Friesian herd covering a 30-yr.

TL;DR: Correlation coefficients between body condition ratings at calving and 4% fat-corrected milk and butterfat percentage were all very small and nonsignificant and Udder edema was significantly correlated with milK production but not with body condition at the time of parturition.

TL;DR: In this paper, the molar composition of the rumen VFA was studied at three dietary ratios of hay to concentrate in 12 dairy cows used in a lactation-balance experiment previously reported.

TL;DR: Correlations between milk production on test day, and the sum of milk produced on ten test days, were higher for the young cows, were similar for different milking frequencies in the same age group, and were highest during the 4th to 7th mo.

TL;DR: A comparison between the two heritability estimates, as well as a comparison of these estimates with repeatability estimates, demonstrated that the length of the gestation period was primarily a characteristic of the fetus.

TL;DR: Prediction equations which utilize both individual performance and herd average are developed and indicate that selection according to these indexes should be 1.19 and 1.35 times as effective as selection based on individual performance alone, without reference to herd averages, in the Jersey and the Holstein population, respectively.

TL;DR: In this article, the role of solution temperature in terms of its effect on the rate of the reaction was evaluated in the context of cleaning of milk films by solutions of sodium hydroxide.

TL;DR: In this paper, experiments were carried out to determine the factors affecting the growth of staphylococci in raw milk and Cheddar cheese and found that milk with a relatively low standard plate count was found to support an active growth at 32° C and a moderate growth at 22° C.

TL;DR: In this paper, a standard procedure for performing the Harland-Ashworth whey protein nitrogen determination is presented, which uses appropriate mixtures of salt filtrates prepared from two lots of nonfat dry milk, one containing a low, and the other a high, level of undenatured protein.

TL;DR: In this paper, a homologous series of methyl ketones was identified by means of their 2,4-dinitrophenylhydrazones, in both the steam distillate and the unsaponifiable matter from milk fat.

TL;DR: In this paper, the formaldehyde produced by periodic acid oxidation is measured colorimetrically by reaction with chromotropic acid and isomerization with perchloric acid was used to convert 2-monoglycerides to 1-monoglobides.