Medicine and Health Sciences Commons^™

Exploring How Maternal Phosphorus Status Affects Calf Growth And Performance, Elizabeth Lafferty

Animal Science Undergraduate Honors Theses

This study will focus on how maternal phosphorus status of beef heifers affects the growth and performance of their calves. Heifers have been offered free-choice mineral with either 0 or 4% supplemental phosphorus from 30 days after weaning until calving. A study by H. Hilfiker, a University of Arkansas honors student, investigated the effects of these treatments from 30 days after weaning until 60 days after the breeding season when heifers were confirmed to be bred or open. For this developing heifer project 64 crossbred Angus heifers were assigned randomly into 8 groups (8 heifers/ group) before assigning each group …

Genetic Variation In The Bovine Myogenic Determination Factor 1 (G.782g>Apolymorphism) And Its Influence On Carcass Traits In Turkish Grey Steppe Cattle, Sena Ardiçli, Özden Çobanoğlu

Turkish Journal of Veterinary & Animal Sciences

MyoD1 gene is a member of the myogenic differentiation gene family, which plays a crucial role in growth and development. There is a lack of information about the MyoD1variants and their phenotypic influences in Turkish Grey Steppe cattle. Therefore the present study aimed to determine the genetic variability of MyoD1 g.782G>A polymorphism and to evaluate its effects on carcass characteristics in Turkish Grey Steppe cattle. Analyses were conducted on a total of 142 Turkish Grey Steppe bulls. The PCR-RFLP technique was used for genotyping of the g.782G>A polymorphism in exon 1 of the MyoD1 gene. The population genetic …

Novel Heat Index Models For Subtropical Region Based On Daily Milk Production Incrossbred Holstein Cows, Neeraj Kashyap, Atish Kumar Chakravarty, Bharti Deshmukh

Turkish Journal of Veterinary & Animal Sciences

The quantification of the effect of heat stress imposed due to higher rate of heat gain on animal production is a prerequisite while estimating effects of heat stress. Temperature humidity index (THI) models developed empirically using meteorological parameters have been utilized as an indicator of heat stress. This study attempted to develop a heat index model with respect to productivity of the crossbred Holstein cows. More than 1.23 million daily milk yield records of 1860 crossbred cattle spread over a duration of 30 years were utilized. Statistically significant (p < 0.0001) partial regression coefficients were estimated as 0.0748 ± 0.0009 for dry bulb temperature (T$_{db}$) and -0.2228 ± 0.0011 for wet bulb temperature in model 1, -0.0182 ± 0.0005 T$_{db}$ and -0.1205 ± 0.0006 for vapour pressure in model 2, -0.0150 ± 0.0006 for Tdb and -0.1151 ± 0.0006 for dew point temperature in model 3 while as -0.1283 ± 0.0004 for T$_{db}$ and -0.0394 ± 0.0002 for relative humidity in model 4. The ratio of the partial regression coefficients of meteorological parameters (ß2/ß1) was -2.9791 in model 1, 6.8739 in model 2, 7.6731 in model 3 and 0.3073 in model 4. The developed THI models are based on the effect of meteorological parameters on daily productivity of the dairy animals, so the weightages to meteorological parameters were contrastingly different than the reported THI models. These models may successfully be used to evaluate the impact of heat stress on crossbred Holstein cows with respect to milk productivity and many other traits.

2021 Nebraska Beef Cattle Report

Nebraska Beef Cattle Reports

Cow-Calf Nutrition and Management: Metabolic Profile Associated with Pre-Breeding Puberty Status in Range Beef Heifers 5 • Milk Production Impacts on Cow Reproductive and Calf Growth Performance 8 • Genetic Selection Tools: Using Pooling to Capture Commercial Data for Inclusion in Genetic Evaluations 11 • Categorization of Birth Weight Phenotypes for Inclusion in Genetic Evaluations Using a Deep Neural Network 14 • Genetic Parameter Estimates for Age at Slaughter and Days to Finish in a Multibreed Population 16

Growing Calf and Yearling Management: Effects of Monensin and Protein Type on Performance of Yearling Steers Grazing Smooth Bromegrass Pastures 18 • …

In Vitro Gas Production And Fatty Acids Biohydrogenation Of Diets Containing Different Unsaturated Fatty Acids Sources Plus Crude Glycerin, Arturo Samuel Gomez Insuasti, Yury Tatiana Granja-Salcedo, Julian Andres Castillo Vargas, Juliana Duarte Messana, Ana Paula De Oliveira Sader, Telma Teresinha Berchielli

Turkish Journal of Veterinary & Animal Sciences

An in vitro trial was conducted to evaluate the effects of different unsaturated fatty acids (UFA) sources plus crude glycerin (CGL) on gas production and rumen biohydrogenation (RBH). Incubated diet corresponded to diets containing corn silage (30%) and concentrate (70%) composed of corn, urea, mineral salts, CGL, and different UFA sources as follows: no additional fat (NAF), rumen protected fat (RPF), soybean oil, linoleic acid (LA) or alpha-linolenic acid (LN). Methane concentrations in LA and LN were lower compared to NAF (p < 0.001), but when CH4 was expressed as a proportion of total gas, NAF and RPF showed the greatest values among evaluated UFA sources (p = 0.001). 18:1 t11 concentration showed a faster increase from 0 to 1 h and a slower decrease from 1 to 36 h of incubation, irrespective of UFA source. A higher C18:1 t11 production rate was observed from 1 h to 5 h of incubation, where LA and LN have higher values compared to NAF and RPF diets (p < 0.001). Diets with a high content of LA may be efficient as a nutritional approach to reduce methane production and RBH, resulting in positive effects on vaccenic acid concentrations.