Dairy Science Commons^™

Effect Of The Prolactin-Release Inhibitor Quinagolide On Lactating Dairy Cows, P. Lacasse, V. Lollivier, R. Bruckmaier, Y. R. Boisclair, G. F. Wagner, M. Boutinaud

Farm Animal Husbandry Collection

In most mammals, prolactin (PRL) is essential for maintaining lactation, and yet the short-term suppression of PRL during established lactation by bromocriptine has produced inconsistent effects on milk yield in cows and goats. To assess the effect of the long-term inhibition of PRL release in lactating dairy cows, 5 Holstein cows in early lactation received daily intramuscular injections of 1 mg of the PRL-release inhibitor quinagolide for 9 wk. Four control cows received the vehicle (water) only. During the last week of the treatments, one udder half was milked once a day (1×) and the other twice a day …

Effect Of Brown Midrib Corn Silage And Dried Distillers Grains Plus Solubles On Lactational Performance And Nitrogen Utilization By Dairy Cows, Hugo A. Ramirez

Department of Animal Science: Dissertations, Theses, and Student Research

Thirty six Holstein cows, four ruminally cannulated, (mean ± SD, 111 ± 35 DIM; 664 ± 76.5 kg BW) were used in replicated 4×4 Latin squares to investigate the effects of brown midrib (bm3) and conventional (DP) corn silages, and the inclusion of dried distillers grains plus solubles (DDGS) on milk production and N utilization. In each 28 d period cows were assigned to one of four treatments: DP plus 0% DDGS (CON); bm3 plus 0% DDGS (BMR); DP corn silage plus 30% DDGS (DP+DG); and bm3 plus 30% DDGS (BMR+DG). Dry matter intake was greater (P < 0.01) for cows consuming bm3 (25.8 VS 24.4 ± 0.47 kg), likewise for DDGS (24.3 and 25.9 ± 0.47 kg/d for 0 and 30%). Compared to DP hybrid, NDFD was higher (P < 0.01) for bm3 (32.5 VS 38.1 ± 1.79%). There was a hybrid × DDGS interaction (P < 0.01) for total concentration of volatile fatty acids (VFA) and rumen pH as the highly digestible treatment BMR+DG resulted in the highest VFA and the lowest pH. Milk yield was not affected by treatment and averaged 30.6 ± 1.09 kg/d. Milk protein yield (MPY) was greater (P < 0.01) for bm3 and DDGS treatments. There was a hybrid by DDGS interaction (P = 0.02) for milk fat yield (MFY) resulting in 1.03, 1.08, 0.84 and 0.78 ± 0.045 kg/d for DP, BMR, DP+DG and BMR+DG. Fat corrected milk (FCM) was affected by DDGS (P < 0.01) and averaged 30.0 and 26.4 ± 1.0kg/d (0% and 30% inclusions). Urinary N excretion was similar among treatments; however fecal N was lower (P = 0.03) for diets containing bm3 corn silage which caused lower (P = 0.02) manure N. These results indicate that bm3 corn silage and DDGS increase DMI, NDFD and MPY; however high inclusion of corn silage with 30% DDGS reduces FCM. Nitrogen excretion was reduced when cows consumed bm3.

The Case For Simplifying Ingredient Statements, Phillip S. Tong

Dairy Science

No abstract provided.

Greener Pastures 1 - The Greener Pasture Project: Managing Nutrients In Dairy Pastures, John Lucey, Mike Bolland, Don Bennett, Richard Morris, Bill Russell, Martin Staines

Bulletins 4000 -

As dairy farmers have strived to maintain profitability, many have farmed more intensively. More cows are milked and increasing inputs of fertiliser and purchased feed are used per hectare. However, these increased nutrient inputs have far exceeded the increase in nutrient output in milk production. The increasing nutrient surplus (inputs minus outputs) from intensification on dairy farms has met with increasing community concern about the environmental footprint of the dairy industry. In some other countries, dairy farmers who have intensified by increasing nitrogen inputs are now faced with legislation controlling the amount of fertiliser nitrogen that they can use.

The …

Caring For Compromised Cattle: Assessing Animals At Risk

Nebraska Beef Quality Assurance Program

Cattlemen have long recognized the need to properly care for their livestock. Sound animal husbandry practices – based on research and decades of practical experience – are known to impact the well-being of cattle, individual animal health and herd productivity. There is no doubt that producers work hard to ensure that their cattle are properly cared for throughout all stages of production. Unfortunately, it’s a fact of raising cattle that some animals will become injured to the extent that they are unable to stand or walk without assistance.

Assessor’S Guide To A Beef Quality Assurance Cow-Calf Assessment

Nebraska Beef Quality Assurance Program

The BQA Cow-Calf Assessment is an on-site educational tool that allows for assessing and benchmarking key indicators of animal care and well-being as well as operational conditions. The Cow-Calf Assessment focuses on three main areas – Animals, Records and Best Management Practices (BMP), and Facilities and Equipment.

2011 Dairy Digest, South Dakota State University Dairy Club

Dairy Digest

No abstract provided.

The Jackrabbit Dairy Review, Vikram Mistry

The Jackrabbit Dairy & Food Review

No abstract provided.

El Azufre En Los Granos De Destilería Para Alimentación De Ganado Lechero., A. D. Garcia, A. R. Hippen, D. J. Schingoethe, K. F. Kalscheur

Dairy Science Publication Database

No abstract provided.

Assessment Of Genome Integrity With Array Cgh Of Cattle Transgenic Cell Lines Produced By Homologous Recombination And Somatic Cell Cloning, G. E. Liu, Y. Hou, J. M. Robl, Y. Kuroiwa, Zhongde Wang

Animal, Dairy, and Veterinary Science Faculty Publications

Transgenic cattle carrying multiple genomic modifications have been produced by serial rounds of somatic cell chromatin transfer (cloning) of sequentially genetically targeted somatic cells. However, cloning efficiency tends to decline with the increase of rounds of cloning. It is possible that multiple rounds of cloning compromise the genome integrity or/and introduce epigenetic errors in the resulting cell lines, rendering a decline in cloning. To test these possibilities, we performed 9 high density array Comparative Genomic Hybridization (CGH) experiments to test the genome integrity in 3 independent bovine transgenic cell lineages generated from genetic modification and cloning. Our plan included the …

Commentary On Immune System Associated Diseases Caused Byviruses: The Role Of Ebv, Dale L. Barnard, J. K. Li

Animal, Dairy, and Veterinary Science Faculty Publications

In her review using the human Epstein–Barr virus (EBV) as an example, Dr. Chen intends to illustrate how host immune systems have evolved in response to pathogens or in many cases co-evolved with pathogens. She discusses why EBV in most people causes what appears to be a self-limiting lymphoproliferative disease (or is it? See her discussion of autoimmune diseases and EBV), but in a very small proportion of individuals the virus causes malignant diseases of severe consequence. She reviews some of the plausible explanations that may include interactions of environmental and host genetic factors resulting in EBV associated malignancies. She …

Evaluación De La Estabilidad De La Leche Y Su Relación Con El Porcentaje De Proteína En Dos Hatos De La Sabana De Bogotá, Luis Alberto Benítez Morales, Germán Alejandro Ordoñez Lozano

Zootecnia

La investigación se llevó a cabo en dos fincas de la sabana de Bogotá con el objetivo de evaluar la relación existente entre la estabilidad proteica y su contenido porcentual en la leche. Se emplearon 30 vacas divididas en 15 animales para cada una de las fincas, se dividieron los animales en tres grupos de acuerdo a su etapa de lactancia. Se tomaron 180 muestras y los datos obtenidos en las distintas evaluaciones fueron analizadas mediante el programa estadístico Statgraphic donde se realizó el análisis de correlaciones lineales de Pearson, para ver el nivel de asociación entre las variables: proteína, …

Maine’S Dairy Relief Program, Tim Drake

Maine Policy Review

This short article looks at Maine’s dairy-relief program, which is viewed as national model of good public policy that can save jobs, support traditional industry, and keep a critical link in our food system

Effects Of Monensin On Metabolic Profile And Feeding Behavior Of Transition Dairy Cows (2011), C.R. Mullins, C.E. Moore, H.B. Green, K.L. Perfield

Kansas Agricultural Experiment Station Research Reports

Thirty-two Holstein transition cows were used to determine the effects of monensin (Rumensin, Elanco Animal Health, Greenfield, IN; 400 mg/cow daily) on metabolism and feeding behavior. Cows were assigned randomly, based on calving date, to control or monensin treatments (n = 16 per treatment) 21 days before their expected calving date, and cows remained on treatments through 21 days in milk. Feeding behavior and water intake data were collected daily. Blood samples were collected at 8 different time points during the experimental period. Monensin decreased mean and peak plasma ketone concentrations, and also decreased time between meals before and after …

Effects Of Supplementing Methionine And Lysine In A Lactation Diet Containing High Concentrations Of Corn By-Products (2011), C.R. Mullins, D. Weber, E. Block, John F. Smith

Kansas Agricultural Experiment Station Research Reports

Ninety-six lactating Holstein cows were used to determine the effects of using commercial supplements to supply additional lysine and methionine in diets containing large proportions of corn by-products. Cows were assigned to 1 of 8 pens. Pens were offered rations formulated to differ in metabolizable lysine and methionine supply. The study was divided into 2 periods. During period 1, cows received similar diets, but the treatment diet supplied supplemental lysine and methionine. During period 2, the treatment diet was modified to reduce dietary crude protein. Feed intake and production were monitored daily, and milk components were analyzed 3 days per …

Effects Of Dietary Amylase And Sucrose On Productivity Of Cows Fed Low-Starch Diets (2011), C.F. Vargas, Barry J. Bradford

Kansas Agricultural Experiment Station Research Reports

Exogenous amylase, sucrose, or a combination was used in diets with reduced starch content. The trial was performed in 48 lactating Holstein cows, and milk yield, milk composition, and dry matter intake were measured. Treatments did not affect production traits, but with slightly decreased feed intake and slightly greater milk production in amylase-fed cows, the calculated value of amylase in this study was $0.37/cow per day.; Dairy Day, 2011, Kansas State University, Manhattan, KS, 2011; Dairy Research, 2011 is known as Dairy Day, 2011

Prostaglandin F2Α And Gnrh Administration Improvedprogesterone Status, Luteal Number, And Proportionof Ovular And Anovular Dairy Cows With Corpora Luteabefore A Timed Artificial Insemination Program (2011), Stephanie Leeann Pulley, H.I. Jr. Mellieon, Jeffrey S. Stevenson

Kansas Agricultural Experiment Station Research Reports

The objective of this research was to increase the proportion of cows with at least 1 functional corpus luteum (CL) and elevated progesterone at the onset of the timed artificial insemination (TAI) program. Postpartum Holstein cows in 1 herd were stratified by lactation number at calving (September 2009 through August 2010) and assigned randomly to 1 of 2 treatments: (1) Presynch-10 (n = 105): two 25-mg injections of prostaglandin F2α(PG) 14 days apart (Presynch); and (2) PG-3-G (n = 105): one 25-mg injection of PG 3 days before 100 μg gonadotropin- releasing hormone (GnRH; Pre-GnRH), with the PG injection administered …

Enhancing Cysteine Content In Yogurt (2011), Soumya Bala, Karen A. Schmidt

Kansas Agricultural Experiment Station Research Reports

Cysteine is considered a conditional amino acid for certain subpopulations. For example, in elderly people, cysteine has been associated with diverse functional properties as a general antioxidant as well as a specific role linked to cataract reduction or prevention. Yogurt is an excellent source of protein, the sulfur-containing amino acids methionine and cysteine in particular. Heat, however, can denature these amino acids and affect their bioavailability. A yogurt mix supplemented with whey proteins (an abundant source of cystiene) coupled with minimal pasteurization of yogurt mixes may increase the availability of cysteine in the final product. In this study, yogurt mixes …

Evaluation Of Methionine Availability To Dairy Cowswhen Added To Mechanically Extracted Soybean Mealwith Soy Gums (2011), D.W. Brake, Evan C. Titgemeyer, Barry J. Bradford, C.A. Macgregor

Kansas Agricultural Experiment Station Research Reports

Twenty-five Holstein cows were fed 5 different diets to evaluate amounts of metabolizable methionine provided to dairy cows from a mechanically extracted soybean meal (meSBM) with methionine added during manufacture. The control diet was designed to be deficient in metabolizable methionine supply. Two amounts of methionine were added from either a commercially available ruminally protected product (RPMet) or from a meSBM with methionine added during manufacture (meSBM-Met). Average milk yield was 98.8 lb/day, average milk fat was 2.81%, and milk urea nitrogen (MUN) averaged 8.6 mg/dL. Milk protein yield was not responsive to metabolizable methionine supply, suggesting that milk protein …

Evaluation Of The 5- Vs. 7-Day Cidr Program In Dairyheifers Before Timed Artificial Insemination (2011), H.I. Jr. Mellieon, Stephanie Leeann Pulley, G.C. Lamb, J.E. Larson

Kansas Agricultural Experiment Station Research Reports

Our objectives were to determine: (1) the effectiveness of an injection of PGF2αto regress the corpus luteum before initiating an timed artificial insemination (TAI) program, (2) ovulation response to gonadotropin-releasing hormone (GnRH), and (3) pregnancy outcomes in dairy heifers inseminated with conventional and gender-biased semen. Heifers (n = 545) from 3 locations (Florida, Kansas, and Mississippi) were assigned randomly to 1 of 2 treatments: (1) 25-mg prostaglandin F2α(PGF2α) injection and controlled internal drug release (CIDR) insert on day −7 followed by 100 μg of GnRH administered on day −5, and a 25-mg PGF2α injection at CIDR insert removal (7D) on …