In the past T.E. Wittum has collaborated on articles with H.C. Voris and G.M. Rogers. One of their most recent publications is The influence of neonatal health on weaning weight of Colarado, USA beef calves☆. Which was published in journal Preventive Veterinary Medicine.

More information about T.E. Wittum research including statistics on their citations can be found on their Copernicus Academic profile page.

T.E. Wittum's Articles: (3)

The influence of neonatal health on weaning weight of Colarado, USA beef calves☆

AbstractThe effect of morbidity during early life on the weaning weight of calves in Colorado beef herds was investigated as part of a prospective longitudinal observational study. A total of 2609 calves born in nine participating herds during the 1990 and 1991 calving seasons were monitored for disease events and subsequently weighed at weaning as a measure of performance. Morbidity outcomes of interest and their observed incidence rates were: general neonatal (to 45 days) morbidity, 2.6%; neonatal diarrhea, 1.0%; neonatal respiratory disease, 1.0%; and mothering problems/weak calves, 0.4%. Mean calf weaning weight was 244±46 kg. Weaning weight data were adjusted by multiple regression for the effects of the herd, year, age of the calf, age of the dam, calf sex, frame size of the dam, and twin birth. General morbidity during the neonatal period resulted in a 15.9 kg reduction (P<0.01) in calf weaning weight. When morbidity was investigated as more specific disease conditions, calves that were classified as mothering problems/weak calves (i.e. calves that experienced maternal neglect, abandonment, or starvation, and weak calves) weighed 24.4 kg less (P<0.01) at weaning than did non-afflicted calves. Respiratory conditions and diarrhea during the neonatal period resulted in 16.5 kg (P<0.01) and 10.7 kg (P<0.05) reductions in weaning weight, respectively. Thus, disease occurrence during the early life of the calf had a detrimental effect on weaning weight.

Characterization of advertisements for puppies sold online: Determinants of cost and a comparison with parent club breeders

AbstractThe Internet is an increasingly common way for consumers to purchase puppies. Yet very little information is available about the types of puppies sold via the Internet. In addition these sales are not subject to United States Depart of Agriculture (USDA) regulation. The objectives of the study were to describe puppies sold via the Internet, to assess the characteristics that contribute to the cost of a puppy, and to compare puppies sold via the Internet with puppies sold by American Kennel Club (AKC) Parent Club breeders. Over 14 weeks in 2008, Yorkshire Terrier, Shih Tzu, English Bulldog, Boxer, and Labrador Retriever puppies for sale on two large-scale online puppy sales sites were categorized based on their Internet advertisements. Data were collected in three categories: puppy characteristics, health characteristics, and policies (such as spay/neuter requirement, health guarantee, and return policy). After the survey was completed, 25 AKC Parent Club breeders and 25 other breeders who advertised via one of the puppy sales websites were randomly selected and interviewed over the phone. Small breed puppies were most frequently advertised with 35.2% (1228/3485) of advertisements for Yorkshire Terriers and 23.0% (802/3485) for Shih Tzus. Almost one quarter of Internet breeders 768/3474 (22.2%) advertised four or more different dog breeds. Champion bloodlines increased the cost of a puppy of all breeds. AKC Parent Club breeders 21/25 (84%) were more likely to mention breed-specific health screening tests when compared to Internet breeders 7/25 (28%). Consumers should apply the same standards for purchasing from a breeder found through a puppy sales site as they would for purchasing from a local breeder. Breeders who advertise at one of the large-scale puppy sales websites are less knowledgeable about breed-specific health issues compared to an AKC Parent Club breeder. Internet breeders are less likely to perform these screening tests on their breeding dogs and may breed dogs with undesirable heritable health risks.

The effect of growth-promoting implant status on the sale price of beef calves sold through a livestock video auction service from 2010 through 2013

ABSTRACTData were collected to quantify the effect of implant status on the sale price of lots of beef calves marketed through a livestock video auction service from 2010 through 2013 and to calculate the percentages of implanted lots. Information describing factors that could potentially affect the sale price of lots of beef calves was obtained electronically from the auction service for 27,746 lots (2,749,406 total calves) selling in 92 video auctions. All lot characteristics that could be accurately quantified or categorized were used to develop a separate multiple-regression model for each study year using a backward selection procedure. Implant status had no effect on sale price in any of the 4 yr of the study (P = 0.53, 0.39, 0.64, and 0.12, respectively, for 2010 to 2013). The percentage of lots that were implanted in each year was 28.4, 30.3, 30.5, and 29.0 for the years 2010 to 2013, respectively, with a mean of 29.5%. The percentage of lots of beef calves that were implanted was relatively low in the West Coast, Rocky Mountain/North Central, and South Central regions of the United States ranging from 18.2 to 27.9%. However, 64.9% of the lots from the South East region were implanted. The results of this study indicated that implant status of beef calves marketed through a livestock video auction service had no effect on sale price. Approximately 30% of all lots were implanted in each year of the study with approximately 33 and 25% of the steer and heifer lots being implanted, respectively.

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