Showing papers in "Journal of Dairy Science in 1976"

TL;DR: Five trials involving infusion of amino acids into the abomasum of lactating Holstein cows suggested that lysine and methionine were first and second limiting, or co-limiting, for secretion of milk protein when rations consisting primarily of corn, corn silage, and alfalfa-grass hay were fed.

TL;DR: Cows calving in January and February were larger in milk yield, fat percent, feed intake, and changes of body weight than cows calve in July and August, and after about 60 days of lactation, feeding was the primary environmental variable limiting performance irrespective of climate.

TL;DR: The fat cow syndrome refers to a combination of metabolic, digestive, infectious, and reproductive conditions which affects the obese periparturient cow which develops primarily due to faulty feed management which permits excessive consumption of unbalanced diets.

TL;DR: Relationships of breeding and management factors to economic return for dairy cows were studied in lifetime records from 933 Holstein cows, finding maximum profit per day-herdlife was expected for cows with 25 mo of age at first calving, 124 days open, and 42 days dry while maximizing milk perday-life and herdlife.

TL;DR: Effects of amino acids upon microbial growth, optimum ratio of nonprotein to amino acid nitrogen for microbialgrowth, and incorporation of amino acid into microbial cells were determined with washed cell suspension in vitro as were rumen microbial cells.

TL;DR: Hormones in plasma as they relate to stressor effects and milk production are important as potential indicators of the physiological state of a cow and reflect the physiological compensations a cow undergoes at various lactation intensities and/or stress exposure.

TL;DR: It is recommended that their behavior in gel electrophoresis under suitable conditions be employed for this purpose for all of the "major" milk proteins of raw skim milk except the immunoglobulins where, because of their heterogeneity and molecular genetics, physical parameters are less useful and their identification must be based upon antigenic determinants and their homology with their human counterparts.

TL;DR: By increasing the mean daily intake of selenium at least 3 wk prepartum from .23 mg to .92 mg daily, overall incidence of retained placenta was reduced from 38% to 0%.

TL;DR: In this article, two color reactions were used to differentiate among these sugars, and the results showed that glucose and galactose were measured by the development of a blue color with maximum absorbance at 710nm after heating in an ammonium molybdate solution buffered with phosphate-phthalate at pH 5.3, a condition under which lactose does not interfere.

TL;DR: The increase in lactoferrin concentration during mammary gland involution appeared to be related closely to the process of involution.

TL;DR: In this paper, the authors measured the reactivity of sulfhydryl groups and disulfide bonds in raw and ultra-high-temperature sterilized skim milk and compared to values for conventional laboratory heat treatments with lower temperatures and longer times.

TL;DR: Experimental design permitted examination of effects due to treatments, time, differences in colostrum, and climatic environment in an analysis of variance, and calves that died had serum immunoglobulin IgG1 falling below the mean for all experimental calves.

TL;DR: Small amounts of amino acids to a diet containing urea as the sole nitrogen source improved considerably rumen microbial protein yields and rates of microbial growth, volatile fatty acid production, and effects of amino acid additions upon microbial nitrogen yields were highest right after feeding and decreased with time after feeding.

TL;DR: Information on variability of somatic cell numbers in Dairy Herd Improvement samples analyzed by the Filter-DNA method came from two field studies, and the model of management practices found no association of herd size and cell numbers.

TL;DR: For example, the authors found that 10% or more dried whey or partially delactosed whey in high concentrate rations of lactating cows usually prevents most of the milk fat depression experienced with such rations without reducing concentrate consumption.

TL;DR: It was felt that cultured yogurt would be beneficial to individuals suffering from lactose intolerance not only because of reduced lactose but also because of lactase, as an endoenzyme in the yogurt culture.

TL;DR: Fat from perirenal and subcutaneous adipose tissue of a dairy cow had composition similar to that of butter samples, and there was no obvious seasonal variation in the distribution pattern.

TL;DR: Milk that had undergone proteolysis exhibited decreased detectable kappa-, beta-, and alphas-caseins and increased loss of beta-lactoglobulin as a result of ultrahigh temperature treatment and coagulation during or shortly after heating increased with severity of heat treatment and size of psychrotroph population.

TL;DR: The casein micelle system of bovine milk is unique in that protein aggregates of similar spherical shape but extreme variability of size are formed by the self-assembly of three major nonidentical subunits, which can be accounted for by only three models.

TL;DR: A greatly increased production and a shortened half-life or greater turnover for plasma IgG1 occurs around the time of parturition which can account for the large accumulation of IgG 1 in colostrum.

TL;DR: Renewed interests in the role of the intestinal microflora again have focused on the intestinal lactobacilli, particularly Lactobacillus acidophilus.

TL;DR: Data collected monthly for one calendar year from Holstein cows lactating under Louisiana ambient climatic conditions comprised a total of 264 cow-months and gave evidence of eosinophila, and in addition, a relative eOSinopenia may have been induced by increased adrenal cortex activity.

TL;DR: It is suggested that low insulin during ketosis is a reflection of depressed blood glucose and, consequently, adipose lipolysis and hepatic ketogenesis are accentuated while acetate utilization and hepatatic triglyceride release are depressed.

TL;DR: In this paper, the role of cholesterol in plasma lipid transport and the metabolism of essential fatty acids in ruminants was investigated in the context of milk fat synthesis and showed a strong correlation between dietary fatty acid intake and total lipid concentration in plasma in lactating cows whereas total milk fat secreted is related to neither of these.

TL;DR: Maternal cortisol at calving was correlated with the time taken to calve, calf cortisol .04, cow:calf weight ratio -.07, and calf weight .14, and evidence that labor is responsible for the increased corticoid is given.

TL;DR: Social behavior was observed in two groups of 17 cows during 13 wk to determine dominance rank and it appears exchange of cows between groups affected both exchanged and nonexchanged cows in a random manner.

TL;DR: Effect of methionine analog was most apparent at low protein as 0 analog cows produced 247 kg fat, and had 156 days open whereas cows on other treatments (.125% analog and/or high protein) produced 264 kg fat and had 124 to 134 days open.

TL;DR: The decrease in milk yield of the transferred cows was not associated with number of agonistic encounters per se, and regrouping had no effect on milk yield after day 1, and mean body weight was not limited.

TL;DR: Gain, intake of solid food, and final body weight were the best predictors for growth of forestomach-compartments, liver, and heart, respectively, and growth of the rumen under stimulation of solid-food intake may be regulated by the same biological factors contributing to increased growth rate of the whole animal.

TL;DR: The coming identity crisis for yogurt is dealt with since "yogurt without bacteria" has now made its appearance as mentioned in this paper, and the results of a brief microbiological evaluation of yogurt and of a consumer preference survey are presented also.