Showing papers in "Journal of Dairy Science in 1970"

TL;DR: The stain, a combination of eosin B and fast green FCF, was effective in revealing acrosomal characteristics of spermatozoa in both fresh and frozen semen samples, indicating that the Wells-Awa stain may be a valuable addition to routinely used semen evaluation measures.

TL;DR: Social dominance and milking temperament were studied in 27 Wisconsin Holstein herds and correlations with stage of lactation, daily milk yield, and lactation milk yield were close to zero.

TL;DR: In studies involving special and purified diets, approximately 9 ppm of zinc were adequate for normal health and performance of calves, however, in a few instances, 20 to 40 ppM zinc in practical diets were not sufficient for optimum performance, but in others, such levels were adequate.

TL;DR: Control of this costly disease must be based on a continuing program of prevention and elimination of infection, and Instituting and maintaining such a program can reduce losses from mastitis by 50% or more.

TL;DR: Three experiments investigated how forages of different chemical composition affect rumination time of cattle, using four dairy heifers and two dairy steers in Experiment I and three single reversal designs in Experiments II and III.

TL;DR: An encapsulated methionine product containing kaolin, tristearin and DL-methionine, formulated to protect the amino acid from rumen degradation, was fed to provide 45, 15, or 5g per day of methionines to eight lactating dairy cows averaging 26kg milk per day.

TL;DR: A 0.20m Tris-yolk extender buffered to pH 6.50 or 6.75 was superior to other combinations tested in preserving motility of sperm as mentioned in this paper.

TL;DR: In this article, the authors evaluated 40 rations with varying digestibility and density and found that fill limited intake of these sheep when the digestible energy of the rations was less than 2.5 kcal/g, whereas above this level energy intake was regulated.

TL;DR: Fat content of milk increased with analog intake and free fatty acid and triglyceride content of serum α -lipoproteins and triglycerides of the β -lipoins were reduced in cows fed analog from those with no analog.

TL;DR: In this paper, the fertility was not significantly affected by the addition of glycerol to Tris-fructose-glycerol-yolk extender or when it was added slowly after cooling to 5C.

TL;DR: The chemical changes during ripening for six months were examined for composition and chemical changes that affect flavor intensity; namely, acidity, pH, soluble protein, lactose, and total volatile fatty acids as discussed by the authors.

TL;DR: There were generally statistically significant differences between the fescues and the other grasses, though Kentucky 31 and Kenwell varieties had gains equal to the other non-fescue grasses in some years.

TL;DR: Salmonella gallinarum was inhibited at an acidic pH by a metabolite produced by Leuconostoc citrovorum, and the primary inhibitor was found to be acetic acid, although lactic acid was slightly inhibitory.

TL;DR: The influence of temperature on the equilibrium water vapor sorption values for dried milk powders varied with the relative pressure P/P o, in the temperature range between 14 and 34C, with both positive and negative temperature effects on adsorption observed.

TL;DR: It was concluded that monthly mature-equivalent factors could not be adequately grouped into a few seasons, that all records should be adjusted for season of calving, and that the most appropriate method of adjusting for both season and age of caling was by multiplicative factors which simultaneously adjust records to the expected yield.

TL;DR: Holstein calves were randomly allotted to two housing systems (inside and outside) and three weaning ages (3, 5, and 7 weeks) within each housing system and three housing systems had no effect on the incidence of scours or pneumonia.

TL;DR: In this paper, 12 lactating Holstein cows were used in a 12-week experiment to compare a conventional concentrate mixture containing: 4.2% ether extract and 13.5% crude protein with the same mixture modified by the addition of soybean oil in different combinations with protein.

TL;DR: Meadow voles were fed semipurified diets of alfalfa, brome grass, and orchardgrass hays and digestibility results were compared with digestibilities from sheep, swine, horses and rats fed hay of similar composition.

TL;DR: Empirical paternal sib analyses of New York Dairy Herd Improvement Holstein records suggest that misidentification is more common among grade cows with registered dams and grade cows having grade dams which are not identified than among registered cows withregistered dams.

TL;DR: The tungstic acid method consistently yielded significantly greater amounts of total nitrogen from the rumen microbial samples, suggesting that limitations in the other methods were of importance in quantitative analyses.

TL;DR: Plasma levels of cortisol and corticosterone were determined in 18 lactating, nonpregnant dairy cows of three breeds and also at hourly intervals following a single injection of 200 IU ACTH to five cows and no treatment to one cow.

TL;DR: Characteristics of the lipids formed by rumen microbes as a result of methionine stimulation were investigated, and it is believed that most of this new lipid was associated with rumen protozoa.

TL;DR: In this paper, a completely clear solution was obtained by adding 5ml of 97% acetic acid to 0.05ml of whole milk, and the protein was calculated from the absorbance at 280 m μ.

TL;DR: In this article, forage ad libitum plus 1kg concentrate per 3kg milk was fed to 36 Holstein cows for 50 days in two trials which lasted 50 days each.

TL;DR: In this article, the effects of five levels of fiber (5 to 60% straw, equal parts of barley, rye, and wheat) and two ratios of starch to sugar (1:1 and 3:1) on the performance of young ruminating calves were investigated.

TL;DR: The study of calves removed from their dams immediately after birth and bled every half hour suggests that the gut was impermeable to colostral proteins by the 24th hour after birth, and the small amount of serum γ -globulin at birth remained constant over the 31 hours in calves fed glucose or nothing.

TL;DR: Bases in evaluation of sires result from misidentified records in the sire group averages used for sire evaluation, and estimates of the correlation between estimated and true genetic value, as well as estimates of genetic progress due to selection are biased.

TL;DR: In this article, an expansion-processed mixture of grain starch and urea called Starea has been shown to increase urea utilization by ruminants, which is the result of more efficient utilization of the ammonia by conversion to microbial protein.