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 41 for “"weaning weight"”.
-
Evaluation of phenotypic and genetic trends in weaning weight in Angus and Hereford populations in Virginia
Total weaning weight records of 29,832 Angus and 15,765 Hereford calves born during 1953 through 1983 in Virginia were used to evaluate phenotypic and genetic trends for adjusted weaning weight (AWWT), weaning weight ratio (WWR) and deviation of AWWT from the mean AWWT of the contemporaries (DEVN). …
-
The Effects of Low Stress Cattle Handling and Weaning Training on Post-Weaning Weight Gain and Calf Activity
… of low stress (LS) handling of beef calves on weight gain and calf activity associated with the weaning process. Cattle were of Angus and Angus cross breeding from two separate herds in Virginia. Handlers for the LS groups went through a short training session. Handlers for the Control (C) …
-
Effects of Birth and Weaning Weight on Variation in Growth Performance Parameters and Carcass Characteristics and Composition of Pigs
… was to determine the effects of birth weight and weaning weight on pig growth performance, fat and lean tissue accretion rates, and carcass characteristics and composition. Study 1 was a retrospective analysis of data collected in two studies conducted under commercial conditions. …
-
Pre- and postpartum nutritional effects on milk production, milk composition, calf weaning weight and postpartum reproductive performance of commercial beef cows
… calving date to one of two milking groups. Milk weight (grams), milk composition (fat, protein, lactose, solids-not-fat, somatic cell count), dam body condition score (1 to 9), dam body weight, dam backfat thickness, loineye area, calf weaning weight and postpartum interval to estrus were all …
-
Relationships among heifer traits, early-life productive traits, and lifetime productivity within Angus and Simmental female cattle
… fertility was associated with birth date, weaning weight ratio and weaning-yearling relative growth rate (RGR). The only calfhood trait that consistently affected fertility in the second breeding season was birth weight of the cow. Fertility of first parity Simmentals was also associated …
-
Comparison of expected and actual progeny growth differences in crossbred calves
… of sires were used: 1) Sires with high yearling weight and high maternal EPD's; 2) Sires with high yearling weight and low maternal EPDâ s; 3) Sires with low yearling weight and high maternal EPD's; and 4) Sires with low yearling weight and low maternal EPD's. The resulting progeny were weighed …
-
Estimates of genetic and phenotypic parameters in Columbia and Columbia X Southdale sheep
… in Columbia and Columbia X Southdale sheep at weaning and yearling ages as well as the phenotypic and genetic correlations among these traits. Information was acquired concerning the effects of year of birth, age of dam, type of birth and rearing, sex, breed, and station on the weanling and …
-
Effects of inbreeding and estimation of genetic progress upon preweaning traits in beef cattle
… to study the effect of inbreeding on birth and weaning weights, ADG birth to weaning and type score at weaning, and estimate genetic progress from selection in each line of each breed. Inbreeding effects were linear and quadratic regressions of the traits mentioned on inbreeding of the calf and …
-
Simulation of genetic control of reproduction in beef cows
… date (CD), postpartum interval (PPI), actual weaning weight (ACTWW) and adjusted 205-d weaning weight (ADJWW). Realized heritabilities and repeatabilities for these outputs were estimated from half-sib intraclass correlations based on 5 yr of records on 100 herds of 50 cows each. Realized …
-
Studies of grazing and nursing behavior in Angus crossbred cattle
… average expected progeny difference for yearling weight and maternal weaning weight. Calves were sired by Angus bulls of United States (US) or New Zealand (NZ) origin. Observations from dawn to dusk were conducted on five days each year, spaced throughout lactation. All nursing episodes were …
-
Management of Katahdin Hair Sheep
… Traditional AM; and 4) Traditional PM for a 14-d weaning period. Behavior was observed at 12, 24, 48, and 72 h post-weaning. Weaning weight, 14-d post-weaning weight, ADG, and total gain did not differ . Vocalizing tended to be greater from fenceline compared with traditional; however, walking …
-
Associations of Single Nucleotide Polymorphisms in the Bovine Prolactin, Melatonin Receptor 1A, and Dopamine Receptor D2 Genes with Hair Coat Shedding Scores and Productivity Traits in Beef Cattle
… both calving rate and cow efficiency. Calf weaning weight and adjusted 205-d weight tended (P < 0.10) to be different for the C1286T SNP site. The SNP site A1134T affected (P < 0.05) calf birth weight, adjusted 205-day weight, and cow efficiency; and tended to affect (P < 0.10) calf weaning …
-
Analyzing the Management Practices of East Texas Beef Cattle Producers
… was established between castration method and weaning weight (p = - 0.204). Calves were weaned 50 pounds heavier when band or surgically castrated. Females were less likely to castrate their calves or utilize a mineral program. Approximately, 49.5% of producers did not pregnancy check their …
-
Evaluating Economic and Environmental Impacts of Changing Herd Sire Genetics on Arkansas Cow-Calf Operations
… was used to estimate breed sire effects on birth weight and weaning weight of the herd's offspring (Kuehn and Thallman 2012a). Together with modified animal performance, the use of 2012 and most recent five- and ten- year Arkansas state average prices, allowed the evaluation of changing herd sires …
-
The Effects of Foot and Udder Scoring on Cow and Calf Performance
… on Angus-based cows over a four-year period. At weaning FA, CS, TS, and US were evaluated. Scores are based on nine-point scales. A score of one indicates straight pasterns, divergent toes, enlarged bottle shaped teats, and absence of a median suspensory ligament; nine indicates weak pasterns, …
-
A study of growth rate and type score of offspring of four different sires in Hereford cattle
… The calves were scored for body types at birth, weaning and the females at approximately fifteen months of age. All calves were weighed at weaning and the females at approximately fifteen months of age. The females were fed a limited ration from weaning until the fifteen month weight was taken. …
-
Phenotypic and genetic evaluation of fitness characteristics in sheep under a range environment
… between lamb and ewe traits including body weight, fleece weight and quality, prolificacy, body condition, ewe stayability and lamb survival. Average heritability estimates for lamb birth weight (BWT), weaning weight (WW), maternal weaning weight, yearling body weight, fleece weight, …
-
The effect of ketamine on stereotypic behavior in pregnant crated sows
… Each animal was injected with 0.5 mg/kg body weight of ketamine or saline as control, the antidepressant dose commonly repeated in the literature. Results showed no difference (P > 0.050) in total ONF stereotypic behavior by treatment, although the duration (min/day) of rooting behavior …
-
Dam type: maternal effects upon dam reproductive performance, calf mortality to weaning and preweaning growth parameters
… of the dam, calf livability, average daily gain, weaning conformation and condition scores, adjusted 205-day weight, actual weaning weight and total damn productivity (kg. calf weaned/cow exposed) were assessed with regard to dam type, as well as individual dam breed effects. Three-breed cross …
Page 1 of 3