The manufacture of cheddar cheese is greatly dependent on bacterial growth for acid production. The quality of cheese depends upon the type and extent of microbial activity. An important function of the lactic fermenting bacteria is the production of acid resulting from cellular metabolism. If little or no acid is production of acid resulting from cellular metabolism. If little or no acid is produced the resulting cheese will have an inferior body, flavor, and texture and may even cause the cheese to be used as grinders. The major causes for inhibited lactic bacterial growth are poor starter handling procedures, antibiotic in mild coming from cows treated for mastitis, quaternary ammonium compounds used in plant sanitation, and bacteriophage. The occurrence of bacteriophage contamination and the increased use of quaternary ammonium compounds and antibiotics have caused a serious problem in cheese manufacturing. Purpose of project. The purpose of this project is to determine if cheddar cheese, comparable to normal cheese, can be made from slow or non-acid milk with the use of added lactic acid. Lactic acid will be used for the purpose of substituting for the acid that is normally produced by bacterial metabolism in the manufacture of cheddar cheese.

Heifers should represent the greatest genetic potential within a dairy herd. To maximize this potential, heifers must be inseminated to proven sires, a practice requiring management changes on many dairies. Holstein heifers (n=115) were allotted to one of three groups to compare alternatives to daily estrous detection that may facilitate the management of a program of artificial insemination for heifers. Group 1 heifers (Controls) received no treatment but were observed twice daily for signs of estrus. Group 2 heifers (2X-PGF) were synchronized with two injections of prostaglandin F2 alpha given 11 days apart and observed for estrus. Group 3 heifers (MGA+PGF) were synchronized with 9 days of melengestrol acetate feeding and an injection of prostaglandin F2 alpha 14 days after the last feeding and observed for estrus. Comparisons were made on the effectiveness of each treatment in estrous response and pregnancy rates and on the management requirements and economics associated with each program. Estrous response was significantly higher for the 2X-PGF group, while synchronized pregnancy and first-service conception rates did not differ. On an annual basis, the MGA+PGF group was calculated to require three-quarters of the labor input as compared to the 2X-PGF group and less than a fifth of the labor required for the Control group. A program of daily estrous detection was calculated to have an economic advantage over synchronization the frequency estrous synchronization programs was scheduled four times per year. was increased to six times per when When year, synchronization had a slight economic advantage over daily estrous detection when animal numbers were low and labor costs were high. The economic advantage of daily estrous detection is reduced when synchronization is performed more frequently throughout the year.

Single nucleotide polymorphisms (SNPs) are single base-pair variations that exist between individuals. There are approximately a million or more SNPs located throughout the genome of each individual animal. Therefore, by taking advantage of these unique polymorphisms, SNPs can be used to resolve questions of unknown parentage in the livestock industry. Currently a panel of 88 SNPs, obtained from a panel of 121 SNPs originally created by USDA-MARC, is commercially available from Fluidigm®. The objective of this study was to determine whether the number of SNPs from the 88-SNP marker panel could be reduced to form a smaller, more cost-efficient parentage-testing SNP panel. A smaller panel would benefit farmers and researchers alike in reducing the time spent in running and analyzing the test, as well as reducing the overall cost for the procedure. Genotype data from over 3000 cattle samples containing offspring and potential parents were examined using two parentage calling software packages. Parentage assessment was analyzed using nine SNP panels of varying size. It was determined that a panel of 71 SNPs, chosen from the original 88 SNPs, was the minimum number required to maintain statistical accuracy and reliability.

Thirty-two lactating cows were assigned at random to four treatments of malic acid to determine if these levels had an effect on milk production, milk composition, feed intake, and efficiency of feed utilization. Malic acid allotment for each treatment consisted of 1) 15.4, 2) 11.6, 3) 7.7, and 4) 0 grams of malic acid fed per kilogram of concentrate. Concentrate was fed according to production at a rate of one kilogram per two kilograms of milk in excess of 9.1 kilograms of milk per cow daily. Alfalfa hay was fed free choice and corn silage at a rate of 11.4 kilograms daily. The cows were on the trial for 8 weeks. Intake of concentrates, silage, dry matter, and digestible energy was highest for cows receiving the 11.6 g level of malic acid. These intakes were significantly higher than for the 7.7 g level but not for the other treatments. However, cows on the 7.7 g level consumed only slightly less feed than control cows. There was no significant effect on hay or crude protein intake. Production of total milk, fat corrected milk, and milk fat was significantly higher for cows receiving the 11.6 g level of malic acid than from the 7.7 g level or control cows. Production of protein solids-not-fat was significantly higher for the 11.6 g level than from the 7.7 g level and approached this level of significance when the 11.6 g level was compared to the controls. Cows receiving the 11.6 g level of malic acid were significantly more efficient in converting dry matter or digestible energy from feed into milk than were the controls. Intakes and production of cows on the 15.4 g level was slightly less than for the 11.6 g level.

Importance of problem: The ice cream industry continually faces the problem of improving its frozen desserts. At the present time corn syrup solids are being used to supplement milk serum solids to improve the body and texture of these products. One of the problems is to increase the total solids content of frozen desserts without increasing sweetness or developing sandiness in the finished product. There is a limit to the amount of milk serum solids that can be used because of the danger of sandiness and the cost . The use of corn syrup solids helps to overcome these limiting factors. The corn syrup solids product now used contains a dextrose equivalent of 42. The corn products manufacturers are beginning to make a product with different dextrose equivalents with different degrees of sweetness. Modifications of DE 42 contain dextrose equivalents of 24 and 31 and will add corn syrup solids of different dextrose equivalents or degrees of sweetness to these frozen desserts. Robert L. Lloyd defines dextrose equivalent as follows: The percentage of reducing sugars present on a dry basis indicates the degree to which conversion has been carried in the hydrolysis of starch. Dextrose has a DE of 100 and is used as the standard. The lower the dextrose equivalent of a product the less the sweetening power. Purpose of problem: 1. To determine the optimun amounts of corn syrup solids to use in building body and texture in frozen desserts without impairing flavor. 2. To determine the comparative value of different amounts of DE 31, DE 24, and DE42.

Bovine trichomoniasis is a venereal infection that reduces the fecundity of cattle. It is caused by Trichomonas foetus, a flagellated protozoan which inhabits the genital tract, causing inflammation and partial sterility. Both sexes are susceptible to infection. In females it is usually of short duration and frequently terminates sponaneously following abortion. In males the disease has both acute and chronic stages. During the acute stage the prepucial membranes become inflamed and a muco-purulent discharge develps in which trichomonads are abundant. In the following chronic stage symptoms disappear, but the animal remains a carrier and is a dangerous source of infection to healthy cows. Diagnosis is made by examining the material from infect organs for the specific parasite. The cell body of Trichomonas foetus is fusiform or napiform. It varies from 9 to 20 microns in length, and from 3 to 7 microns in width. Its salient features are an undulating membrane and 4 flagella arising from the blepharoplast, 3 of which are anterior and free, the fourth proceeds caudad bordering the undulating membrane for its entire length and projecting unattached behind. By means of the flagella and undulating membrane the organism move jerkily through an irregular course, as is characteristic of the genus Trichomonas. Dovine trichomoniasis has a wide geographic distribution. In Europe it has been reported from Italy, France, Germany, Holland, and England. Futamura has reported it from Japan. In the United States the infection is known to be present in the states of New York, Pennsylvania, Iowa, Illinois, Maryland, Texas, Michigan, California, and Utah. Survey work done in Utah under the direction of the Utah Agricultural Experiment Station includes examination of herds in Cache, Utah, Davis, Sanpete, and Sevier Counties. Infections were found present in all counties where examinations were made except Sevier. Because of unrestricted commerce of cattle among the important live-stock centers, it is supposed that trichomoniasis is widely spread and probably exists in some cattle in the majority of the counties of the state.

Domesticated species possess certain cognitive abilities that allow them to thrive in an environment with regular human interaction, and these interactions contribute to the overall human-animal relationship. Studying the human-animal relationship allows us to better understand how domesticated animals perceive and navigate their environment, which can then be used to improve their welfare. In chickens, this relationship is poorly understood, and further research would provide insight into the welfare needs of this animal. Here we show breed differences in the interspecific sociocognitive abilities of Gallus gallus, where the domesticated White Leghorn interacted more with a familiar human than the red junglefowl, and both the domesticated White Leghorn and the red junglefowl breed that had been selected for low fear of humans were habituated to human presence. This study sheds light on the effect of domestication on social cognition in chickens and begins to describe the human-chicken relationship.

The kinetics of milk coagulation are complex and still not well understood. A deeper understanding of coagulation and the impact of the relevant factors would aid in both cheese manufacturing and also in determining the nutritional benefits of dairy products. A method using confocal microscopy was developed to follow the movement of milk fat globules and the formation of a milk protein network during the enzyme-induced coagulation of milk. Image processing methods were then used to quantify the rate of coagulation. It was found that the texture of the protein network is an indicator of the current status of the milk gelation, and hence can be used to monitor the coagulation process. The imaging experiment was performed on milk gels with different concentrations of the coagulation enzyme, chymosin. Rheological measurements were taken using free oscillation rheometry to validate the imaging results. Both methods showed an inverse relationship between rennet concentration and the coagulation time. The results from the imaging study were used to create a computational model, which created simulated images of coagulating milk. The simulated images were then analyzed using the same image analysis algorithm. The temporal protein network texture behavior in the simulated images followed the same pattern as the protein texture in the confocal imaging data. The model was developed with temperature and rennet concentration as user inputs so that it could be implemented as a predictive tool for milk coagulation.

Caseinate powders have been well accepted because of their foaming properties. In this study, 10% solution of reconstituted skim milk powder (SMP) chelated with sodium hexametaphosphate (SHMP) and trisodium citrate (TSC) at 1 mEq, 50 mEq, and 100 mEq were prepared to conduct a comparison with sodium caseinate, potassium caseinate, and calcium caseinate solutions. Foamability, foam stability as well as the preferential locations of αs-casein, β-casein and !-casein in their foams were analyzed. It was hypothesized that the foamability, foam stability and the preferential locations of these three caseins in the milk foams are different from treatment to treatment. Milk foam was generated with an air- injection method at a flow rate of 0.30 L/M for 18 seconds. Foam stability was measured through half-life method. The foam composition was quantified with sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) method. Analysis of Variance (ANOVA) test results concluded that there were no significant differences detected in foamability (p>0.05). On the other hand, foam stability differed significantly among the treatments. Foams of reconstituted SMP-treated with 1 mEq SHMP and TSC were significantly more stable compared to other treatments (p < 0.05), β-casein (p>0.05) and !-casein (p>0.05). In conclusion, the addition of calcium chelating salts might increase the foamability to the same level as caseinate solutions. Furthermore, the study proved that the combination of calcium chelating salts and chelator levels is able to alter the foam stability.

The objective of this study was to measure the effects of both a nutritional (water nipple) and social (partner calf) enrichment on calf body weight, grain intake, water intake, behavior and learning. The enrichments included 1) water provided from a nipple vs. a bucket (nutritional) and 2) visual and tactile access to a partner vs. isolated rearing with no visual or tactile access to a partner calf (social). A total of 72 Holstein and Jersey dairy calves were pseudo-randomly distributed into 4 treatments at birth [Individual/Bucket (IB), Paired/Bucket (PB), Individual/Nipple (IN), Paired/Nipple (PN)]. Socially and nutritionally enriched calves drank more water than non-enriched calves (Social: 5.02 ± 0.27 kg/d vs 3.723 ± 0.27 kg/d respectively; P = 0.0009; Nutritional: 4.93 ± 0.27 kg/d vs. 3.81 ± 0.26 kg/d respectively; P = 0.004). No difference in daily grain intake was found between individual or pair reared calves except during wk 8 (1.31 ± 0.07 kg/d vs 1.60 ± 0.07 respectively kg/d; P= 0.04). There were no differences in average body weight among treatments (P > 0.20). Pre-milk delivery, calves reared on a water bucket spent more time standing (P= 0.03) and when paired, less time non-nutritively suckling compared to water nipple reared calves (P = 0.05). Grooming time was highest during period 2 (wk 3, 4, 5; P = 0.01)) pre-milk delivery. Post-milk delivery, calves reared on a water bucket spent more time drinking milk (7.13 ± 0.40 vs 5.37 ± 0.39 min; P = 0.005)and grooming (P= 0.05), and less time drinking water (P < 0.001)and lying (6.17 ± 1.02 vs 9.19 ± 0.97 min, respectively; P= 0.04)than water nipple reared calves. Water nipple calves when paired exhbited longer drinking times (P = 0.04)..The most notable behavior was cross suckling post-milk delivery, as the weeks progressed water bucket reared calves increased time spent cross-suckling while water nipple calves maintained the amount of time spent cross-suckling. At wk 8 a subset of 24 calves (6 from each treatment) were trained over 14-d period to differentiate between an “X” and “O” cue to receive a milk reward (visual discrimination task). Learning (% correct choices) was compared using a Wilcoxon-signed rank test. Calves individually reared had greater overall correct choices than pair reared calves (0.63 ± 0.02 % correct/total choices vs 0.57 ± 0.02 % correct/total choices respectively: P = 0.05), while calves reared with a nutritional enrichment (water nipple) had greater overall correct choices compared to water bucket reared calves (0.64 ± 0.02 % vs 0.56 ± 0.02 %, P = 0.02). These results indicate that social and nutritional enrichments positively influence calf cognitive performance, water intake, and lying, cross-sucking, grooming behaviors.