Showing papers in "Journal of Dairy Science in 1955"

TL;DR: In this paper, the proteins in the serum obtained after removal of the denatured serum proteins with the casein at pH 4.6 were examined by a quantitative electrophoretic procedure.

TL;DR: It is suggested that the time and mode of administration of Cr 2 O 3 employed in the conduct of grazing studies should be determined by the nature of the experiment and the convenience of the operation, as well as the effectiveness of the procedure for measuring fecal output.

TL;DR: Factors necessary for the growth of Bacteroides succinogenes and present in the volatile acid fraction of rumen fluid have been identified.

TL;DR: Examination of cows at the end of different intervals after calving showed that 95% or more of the cows in heat had their uteri involuted after an interval of 90 days, and significant differences were observed among seasons, being shortest in the summer and autumn.

TL;DR: The relations between various parts of completed lactation of at least 243 days duration were considered in 599 lactations of 253 Holstein cows in the Iowa State College herd, with efficiency values ranging from 0.74 to above unity.

TL;DR: It is shown that level of herd production has far more influence on the relationship between level of production for successive lactations than doeslevel of production among progeny groups of sires, the latter association being essentially zero.

TL;DR: The inclusion of aureomycin or terramycin in the rations of dairy calves seems to be best justified by the beneficial effects of these antibiotics in reducing calf scours and thus calf mortality.

TL;DR: A study was made to determine the percentage of repeat-breeder cows with normal embryos at 16 elapsed days of gestation and the embryonic death rate between 16 and 34 elapsed days, and the estimate of embryonic death from 16 to 34 days was 51.7%.

TL;DR: A technique based on the use of washed suspension of rumen microorganisms was developed for the study of in vitro cellulose digestion and its use in detecting unidentified factors, as well as in determining the mineral requirements for maximum utilization of cellulose by rumenmicroorganisms.

TL;DR: The expected genetic improvement of milk and fat yield was greatest when milk yield alone was the basis of selection, while fat yield alone is a good criterion of selection for improving the genie value of fat yield.

TL;DR: Although the difference between outbreds and inbreds was not statistically significant in either case, the trend was for inbreeding of either embryos or dams, particularly the latter, to increase embryonic mortality.

TL;DR: The amount and percentages of the acids investigated in the rumen contents of these calves on a normal diet tended to stabilize at least by the second month of life, and by about 6 months of age few differences existed between the calf and the adult under this feeding regime.

TL;DR: The variability in content of serum proteins and in their heat denaturability imposes serious limitations on the use of serum protein analyses for assessing dry milks of unknown history for specific uses.

TL;DR: In this article, the optimal combination of per cent sodium citrate, per cent glycerol (by volume), and equilibration hours which would allow maximum survival of motile spermatozoa after being frozen for 5 days by use of dry ice was designed.

TL;DR: There was a progressive increase in sperm survival in all diluter treatments after freezing to −75° C. as the glycerol equilibration time was increased from 2 to 18 hours, and a highly significant interaction of egg yolk and Glycerol levels was demonstrated.

TL;DR: In this paper, it was shown that 75 to 90% of the casein in fresh untreated skimmilk appears to exist as a single phosphoprotein, which is probably a definite mixture or combination of α-, β-, and γ-caseins.

TL;DR: A simple test for detection of inhibitory substances in milk is outlined, based on the conversion of 2,3,5-triphenyltetrazolium chloride (TTC) to formazane, characterized by a color change from the leucoform to red in the presence of growing bacterial cells.

TL;DR: The fertility of bovine spermatozoa frozen in a concentrated form, thawed at 5° C. at the bull stud and used for breeding 24 to 60 hours later, was compared with that of semen frozen in single-breeding vials.

TL;DR: In this article, the rate of rennet action and curd tension of non-homogenized milk have a similar action on rate of coagulation but very little or no effect on the curd-tension obtained by rennet actions on homogenised milk.

TL;DR: The ability of the isolates to deaminate serine varied, but the strains showing the highest activity were isolated from the better samples of Cheddar cheese as mentioned in this paper, and the cheese containing the highest relative concentration of "free" H 2 S received the highest Cheddar flavor intensity score.

TL;DR: The results of this study suggest that the need for dietaryManganese by calves is extremely low and that increased amounts of calcium and phosphorus intensify the needs for dietary supplements of manganese.

TL;DR: In this paper, the general characteristics of the lipase systems of ten preparations used in the manufacture of Italian cheese were investigated in respect to activity at various temperatures, pH levels, and substrate concentrations.

TL;DR: In this article, the authors used a chromatographic-radioautographic technique to detect the presence of iodide compounds other than iodide in the milk of goats treated with I 131 -labeled iodocasein or sodium iodide.