Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 43 for “"Holsteins"”.
-
Weighting components of type in classifying Holsteins
Thesis (M.S.)--Michigan State University. Dept. of Dairy, 1967
-
Hormones, Metabolites, and Reproduction in Holsteins, Jerseys, and their crosses
… 48 were Jersey-Holstein (JH) crosses, 51 were Holsteins (HH), and 29 were Jerseys (JJ). Days open (DO) was affected by genetic group. HH had 168.6 ± 9.6 DO which was different from HJ (142.9 ± 11.3 d), JJ (132.1 ± 12.1 d), and JH (127.2 ± 9.3 d). HH had 2.4 ± 0.1 services per conception which …
-
Protein partition and digesta flow in lactating Holsteins fed 2:1 and 1:2 soybean meal:fish meal
Attempts to improve upon the crude protein feeding system have strived to characterize feedstuffs with respect to ruminal protein degradability. In vitro an in situ procedures fall short of this goal by not accounting for ruminal turnover. Six lactating cows, fitted with ruminal and duodenal …
-
The role of energy balance in productivity, health, and fertility of first lactation Holsteins, Jerseys, and their reciprocal crosses
The Virginia Tech crossbreeding program began in the fall of 2002 by mating Holstein and Jersey foundation females to Holstein and Jersey bulls to create HH, HJ, JH, and JJ breed groups (sire breed listed first). Collection of daily dry matter intakes (DMI) began in the fall of 2005 and continued …
-
Nutritional and endocrine aspects of the lactation cycle of Holstein and Jersey cows: nutrient balances, response to supplemental dietary fat, rib composition and rib histology
… plasma somatotropin on day after calving, but Holsteins had higher glucose on day of and day after calving. Plasma parathyroid hormone did not differ between breeds, but Jerseys had higher 1,25-dihydroxyvitamin D₃ than Holsteins on both days after calving. Plasma total calcium and ionized …
-
Comparisons of Holstein, Brown Swiss, and Jersey cows for age at first calving, first calving interval, and true herd-life up to five years in seven regions of the United States
… Florida, and Texas. Brown Swiss were older than Holsteins at first calving (833 ± 2.4 d vs. 806 ± 2.0 d in regions, and 830 ± 3.1 d vs. 803 ± 2.4 d in states), but Holsteins and Brown Swiss did not differ for first calving interval. Jerseys were younger than Holsteins at first calving and had …
-
The effect of selection for milk yield on net energy balance and plasma concentrations of endogenous hormones and metabolites in primiparous Holsteins
… genetically selected high- and low-yielding Holsteins during early lactation, but the question remains if these differences are due to energy balance differences or differences in genetic merit for milk yield.
-
LIVELLI DI PASCOLO, COMPONENTI VOLATILI, ANTIOSSIDANTI E QUALITÀ DEL LATTE
… dairy farms were selected, two with both Holsteins and Brown Swiss cows and two with only local breed Modicana cows. Bulk milk of each breed per farm was sampled four times per experimental period (spring, summer, and autumn). Samplings within period occurred with weekly intervals. Pasture …
-
Effects of herd mean and standard deviation on cow indexes for milk , and adjustments of cow indexes for these effects
… used to compute Cow Indexes (CI) for 581,519 Holsteins and 352,758 Jerseys. CI were used to predict Modified Contemporary Deviations (MCD) of daughters at three levels each of herd mean (µ) and standard deviation (σ), and regressions were compared to expected values. For Holsteins, regressions …
-
Offering sodium bentonite and sodium bicarbonate free-choice to lactating dairy cattle
… parameters. Eight Jerseys and seventeen Holsteins (four fistulated) were randomly assigned to two groups to equalize stage of lactation, age and production history. Two diets were fed: diet 1 without added sodium bicarbonate and diet 2 with sodium bicarbonate added at 1.2% of dry matter. …
-
Genetic analysis of hoof traits
… and interdigital dermatitis were worst in Holsteins. Generally, Ayrshires and Jerseys had better claw scores than Holsteins. November was the highest risk season for heel erosion, sole ulcers and laminitis, whereas the frequency of slight separation of white line was higher in July. …
-
Effects of Prepartum Energy and Protein Density on Productivity and Influence of Dietary Iron on Copper Status of Holstein and Jersey Cattle
In experiment 1, 24 multiparous Holsteins and 24 multiparous Jerseys were assigned at random to one of four diets containing either 1.25, 1.38, 1.50, or 1.63 Mcal NEL/kg DM to determine the effects of prepartum energy density on productivity. Cows were assigned to diets 28 d before expected calving …
-
Artificial Induction of Lactation in Nonbreeder Dairy Cows
Thirty-four cows (26 Holsteins and 8 Jerseys) were subjected to an estrous synchronization protocol administering 2 PGF2Æ Ã injections 11 d apart prior to beginning the lactation-induction protocol. Artificial induction of lactation yielded a 92% success rate for Holstein cows with success defined …
-
The role of Beta carotene in dairy cattle reproduction and its in vivo effect on corpus luteum function
… hormones during early lactation, seventy-eight Holsteins were alternately assigned at calving to either supplementation with 600 mg synthetic B daily (BC) from day 30 through day 90 of lactation or be controls (C). Cows were fed a basic corn silage complete ration. Biweekly jugular blood samples …
-
Modifying Fatty Acid Composition of Bovine Milk by Abomasal Infusion or Dietary Supplementation of Seed Oils or Fish Oil
… abomasally infused (342 to 371 g/d) into three Holsteins and three Jerseys during the last 5 d of each of four 10-d periods. The intestinal digestibility and concentration of cis-18:1 and 18:2 in milk were proportional to flow of these fatty acids to the duodenum. Also, greater concentration of …
-
Effects of Vitamin E Supplementation in Late Gestation Cattle and Evaluation of Vitamin E, Cholesterol, and Phospholipid Relationships in Bovine Serum and Serum Lipoproteins
… Se and lower serum vitamin E concentrations than Holsteins at dry-off and higher blood Se concentrations than Holsteins 3-4 weeks pre-calving and at calving. Selenium supplementation increased blood Se concentrations at calving. Treatment did not affect serum vitamin E concentrations at calving or …
-
A study of somatic cell concentrations in milk of laboratory mice
… SCC in mice was 4 to 5 times the distribution in Holsteins. The shape of the lactation curve of mice was similar to that of Holsteins with maximum yield at day 7 (2.06 gms). The phenotypic regression of lactation milk yield on lactation milk SCC (-0.276) was significant (P < .05) and indicated …
-
Effect of dietary protein degradability and fat on rumen, blood and milk components of Jersey and Holstein cows
… fed added fat. Milk protein yield decreased in Holsteins fed 41% RUP. Milk protein content was reduced 7.1% by added fat and 3.9% by 41% RUP, and milk urea N (g/100g N) was increased by added fat and 41% RUP. Milk urea N followed PUN pattern throughout the day. Added fat reduced content, but not …
-
Performance of Pre and Post-Partum Weather Stressed Cows Supplemented with Yeast Culture
… was no significant statistical difference in Holsteins treated WY versus the Holsteins in the CG group. In the third trial, ECM was statistically significant at (p= 0.05) in the CC5 groups versus the CG group. The CC5 group differed from YS group at the (p= 0.05) level in the Holstein groups …
-
Lactational Evaluation of Protein Supplements of Varying Ruminal Degradability
<p>Twelve lactating Holsteins, (9 multiparous and 3 primiparous) were used in a replicated 3x3 Latin square design to evaluate 3 protein supplements that varied in RUP and amino acid composition. Cows received either 44% solvent soybean meal, expeller soybean meal, or an animal vegetable blend as a …
Page 1 of 3