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Showing 1 to 20 of 60 for “"lactating cows"”.
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Response of Lactating Cows to Added Unsaturated Fat and Niacin
<p>Sixteen lactating Holstein cows were utilized in a 4x4 Latin square with 4 wk periods to evaluate the response to supplemental fat and niacin. Diets were control, control plus niacin (12 g/d), added fat, and added fat plus niacin. All total mixed diets (DM basis) contained 25% alfalfa hay, 25% …
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Methods to Evaluate Protein Quality of Diets for Lactating Cows
<p>Ten multiparous and five primiparous cows (x= 62 ± 33 days in milk) were utilized in a replicated 5 x 5 Latin square design with 21-d periods to investigate the differences between three systems for evaluating dietary protein quality for lactating cows: a) milk protein score (MPS); b) Cornell …
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Nutritional Management Strategies to Increase Energy Intake of Lactating Cows
… were evaluated utilizing 71 Holstein dairy cows (34 primiparous and 3 7 multiparous) in a total lactation trial. Cows were randomly assigned at parturition to 1 of 3 dietary treatment regimes: Control (CON = 50:50 forage: concentrate (F: C) first 100 d); increased caloric density from …
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Barley silage harvested at boot and soft dough stages for lactating cows
… boot, SD-Lo and SD-Hi, respectively. Thirty-six lactating Holstein cows were fed boot silage at 75 and 60% of diet DM, SD-Lo fed at 75 and 60 and SD-Hi fed at 75 and 60, respectively. Milk yields (kg/d) were greatest for high concentrate diets and averaged 25.7, 28.3, 24.8, 26.3, 25.7 and 26.9, …
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Intake, digestion site, extent of digestion and digesta kinetics in grazing lactating cows
… has led many dairy farmers to use pasture for lactating cows to reduce their production cost. Little is known about the efficiency of nutrient utilization by lactating cows under grazing conditions. The objective of this study, therefore, was to investigate ruminal turnover, intake and site and …
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Dye Marking of Antibiotics Used in Treatment of Mastitis in Dry and Lactating Cows
… is the one major disease affecting dairy cows; considerable direct and indirect economic losses can be attributed to mastitis (6). Treatment of mastitis with antibiotic preparations will alleviate most disease symptoms. Problems may arise when cows treated with antibiotics have their milk …
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Glucose clearance studies in lactating cows: influence of stage of lactation and ration composition
… determined for eight first-lactation Holstein cows at three lactation stages [early (E) = 75-100 days, late (L) = 205-250 days, and dry (D) ]. A corn silage-based ration (15% CP, 22% ADP) was fed ad libitum during lactation and at maintenance during D, using 4-hr feeding intervals. Three …
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Partitioning of nitrogen by lactating cows fed diets varying in nonfibrous carbohydrate and rumen undegradable protein
Four multiparous Holstein cows, averaging 44 days in milk and previously fitted with rumina1 and duodenal cannulae, were utilized in a 4 x 4 Latin square design to evaluate effects of dietary nonfibrous carbohydrate (NFC) and rumen undegradable protein (RUP) on metabolic and lactational parameters. …
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The effects of dietary forage, social hierarchy, and stocking density on stress in lactating cows during relocation
… hierarchy, and stocking density on stress in lactating cows during relocation to new dairy facilities. In experiment one, 23 lactating cows were fed a basal ration, or the basal ration plus grass or alfalfa hay at 10% of DM offered from 3 wk pre-move to 9 wk post-move. In experiment two, 17 …
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Responses to abomasal infusion of casein, hydrolyzed casein or methionine-lysine and dietary protein degradability in lactating cows
… dietary protein were studied in eight Holstein cows during mid-lactation. Basal diets contained com silage, com and either soybean meal or 60:40 soybean meal:corn gluten meal, and had estimated rumen degradabilities of 70 and 60.5%. Duodenal cannulas were installed in four of the cows to allow …
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IMPROVING REPRODUCTIVE PERFORMANCE THROUGH THE DEVELOPMENT OF A DAIRY HERD INDEX, INTRAUTERINE HORMONE DELIVERY OR INSEMINATION TECHNIQUE IN LACTATING COWS
… aimed at improving reproductive performance in lactating dairy cows. The first specific aim (Chapters 3 and 4) evaluated the effectiveness of using protective plastic sheaths to minimize vaginal contamination of the AI catheter at the time of AI and pregnancies per AI in lactating dairy cows …
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Evaluation of Corn Distillers Grains and a Blend of Protein Supplements with or without Ruminally Protected Amino Acids for Lactating Cows
… with 4 wk per period, 12 multiparous Holstein cows averaging 83 d postpartum were used to compare com distillers grains (CDG) versus a blend (BLEND) of other protein sources (fish meal and soybean meal) with CDG, and to determine the effectiveness of ruminally protected lysine and methionine …
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Influence of Microbial Inoculants for Corn Silage on Fermentation Characteristics and Nutrient Composition in Vitro, and on Production Responses in Lactating Cows
<p>The effect of three commercial microbial inoculants for corn silage on fermentation and silage composition were evaluated in laboratory silos. Treatments were control and three microbiai inoculants: Nordica Corn Silage Inoculant, AgMaster Corn Silage Inoculant, and Pioneer Silage Inoculant. The …
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Impact of endotoxemia on ovarian signaling and function
… models; pre- and post-pubertal gilts, as well as lactating cows, were exposed to HS and/or LPS to perturb intestinal integrity and/or mimic chronic endotoxemia. We analyzed mRNA and protein abundance in hepatic and ovarian tissue via qRT-PCR, western blotting, and immunohistochemistry, as well as …
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Effects of source and amount of energy and protein on ruminal fermentation, nutrient passage to the small intestine, and performance of lactating Holstein cows
Three experiments were conducted using lactating cows fitted with ruminal and duodenal cannulae to investigate the effects of source and amount of energy and crude protein (CP) on nutrient flow to the duodenum. In each experiment, four Holstein cows were used in a 4 x 4 Latin square with treatments …
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Enhanced Biological Phosphorus Removal from Dairy Manure to Meet Nitrogen:Phosphorus Crop Nutrient Requirements
… (SBR) was designed for a dairy farm with 700 lactating cows and 325 ha of corn silage. An economic analysis of EBPR for dairy farms employing P-based manure applications was completed. The cost of hauling excess manure to nutrient deficient farms was the most significant expense in comparing …
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Genetic Parameters for Udder and Teat. Type Traits in Icelandic Cattle Breed
… and teat type traits between first and second lactating cows, and correlations of udder and teat type traits and first lactating somatic cell score were estimated. Breeding values were estimated, and genetic trends were reviewed. Phenotypic variances of udder and teat type traits were small, as …
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Gluconeogenesis in the liver of growing and lactating ruminants: the influence of ration composition and stage of lactation
… calves compared to GR- and CH-feet animals. Ten lactating and five dry Holstein cows were liver biopsied at various stages of lactation (30,60,90,120,180 days postpartum and dry) and when fed two rations, control ( 18% CF) or high concentrate (HI CONC, 10.5% CF). Lactating cows at 30 and 60 days …
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Comparison of pregnancy rates, progesterone concentrations, and expression of genes associated with progesterone synthesis in heifers and mature cows
… have steadily declined, particularly in mature cows. Fertility of heifers that were bred for the first time has not been affected. One of the major reasons for such fertility decline in mature cows could be impaired progesterone production. Therefore relationships of parity with reproductive …
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Digesta Passage, Fermentation, and Microbes in the Hindgut and Its Relative Contribution to the Nutrition of Cattle
… was far more complete than would be expected for lactating cows, for whom both the quantity and degradability of digesta reaching the cecum and colon is expected to be much greater. Therefore, for lactating dairy cows, contribution of the cecum and colon to total tract digestion and diet …
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