scholarly journals Randomized field trial on the effects of body weight and short transport on stress and immune variables in 2‐ to 4‐week‐old dairy calves

2019 ◽  
Vol 33 (3) ◽  
pp. 1514-1529 ◽  
Author(s):  
Christien Masmeijer ◽  
Bert Devriendt ◽  
Tina Rogge ◽  
Katharina Leenen ◽  
Lieze De Cremer ◽  
...  
Keyword(s):  
Body Weight ◽  
Field Trial ◽  
Dairy Calves ◽  
Randomized Field Trial

scholarly journals Response to Letter to the Editor: “Effectiveness of Prenatal Vitamin D Deficiency Screening and Treatment Program: A Stratified Randomized Field Trial”

2018 ◽  
Vol 104 (2) ◽  
pp. 339-340
Author(s):  
Fahimeh Ramezani Tehrani ◽  
Sonia Minooee ◽  
Maryam Rostami ◽  
Razieh Bidhendi Yarandi ◽  
Farhad Hosseinpanah
Keyword(s):  
Vitamin D ◽  
Vitamin D Deficiency ◽  
Treatment Program ◽  
Field Trial ◽  
Letter To The Editor ◽  
Randomized Field Trial ◽  
Deficiency Screening

scholarly journals PSVIII-28 The effect of adaptogen on the growth and development of dairy calves

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 302-302
Author(s):  
Irina Lunegova
Keyword(s):  
Body Weight ◽  
High Growth ◽  
High Growth Rate ◽  
Feed Additives ◽  
The Body ◽  
Dairy Calves ◽  
Feeding Mode ◽  
Holstein Breed ◽  
Experimental Group ◽  
Intensive Growth

Abstract For the harmonious development, intensive growth and preservation of young animals in the diet it is necessary to include various feed additives, complexes, adaptogens that enhance the metabolic processes in the body. The purpose of the study is to study the feasibility and effectiveness of the use of adaptogen in calves rations. To achieve this goal in industrial conditions, 30 calves of Holstein breed at the age of 5–7 days were selected and divided into two groups of 15 animals each. The duration of the experiment was 90 days. Calves of the experimental group in milk, and then in concentrates included adaptogen “Energy” in the amount of 250 mg / kg body weight. The control animals were fed according to the standard scheme in the farm. The feeding mode for all calves was in accordance with the growing technology. The adaptogen includes: succinic, citric acid, inulin, oligofructose, methionine, lactic acid bacteria immobilized on aluminosilicate (patent RU 2493725). The results of the experiment (table 1) showed that the inclusion of an adaptogen provided a high growth rate throughout the entire period. At the end of the experiment, the body weight of calves of the experimental group was 6.52% (P > 0.05) higher compared to the control.

Blood Volumes of Dairy Calves Comparing Cr51-Tagged Red Blood Cells and T-1824 Plasma Dilution Methods

1958 ◽  
Vol 193 (2) ◽  
pp. 244-248 ◽  
Author(s):  
Perry Ruth Stahl ◽  
Homer E. Dale
Keyword(s):  
Body Weight ◽  
Red Blood Cells ◽  
Whole Blood ◽  
Blood Cells ◽  
Dairy Calves ◽  
Computation Method ◽  
Blood Samples ◽  
Whole Blood Samples ◽  
Blood Volumes

In a repeated study on 17 dairy calves, T-1824 dye plasma dilution showed significantly higher blood volumes than were found by any other technique or computation method using Cr51-tagged red blood cells. Five blood samples taken at 20-minute intervals after injection showed consistent decrease in radioactivity count from the first to the last sample, indicating greater accuracy in radioactivity dilution regressed to zero time figures than in average counts of several postinjection samples. In vitro studies suggest a loss of Cr51 from red blood cells to plasma after saline washings are Cr-free. Percentage blood volumes computed from whole blood samples of calves injected with Cr51-tagged red blood cells decreased in a straight line relationship with increase of body weight. Percentage plasma and whole blood volumes estimated with the T-1824 dye technique decreased regularly with body weight increase until a second determination was made when there was a rapid rise nearly to the level of the smallest calves, followed by another regular decrease with increase in weight. It is suggested that repeated dye injections do not always measure the same space. Regressed values of five whole blood samples taken at 20-minute intervals after injection of Cr51 tagged red blood cells gave more consistent blood volume determinations than either the weighed red cells or the plasma dye dilutions of the same samples.

Developing Ambitious Mathematics Instruction Through Web-Based Coaching: A Randomized Field Trial

2020 ◽  
Vol 57 (6) ◽  
pp. 2378-2414 ◽  
Author(s):  
Matthew A. Kraft ◽  
Heather C. Hill
Keyword(s):  
Field Trial ◽  
Math Instruction ◽  
Web Based ◽  
Sustained Effects ◽  
Randomized Field Trial ◽  
Interim Assessments ◽  
Mathematical Quality ◽  
Math Test ◽  
Math Test Scores

This article describes and evaluates a web-based coaching program designed to support teachers in implementing Common Core–aligned math instruction. Web-based coaching programs can be operated at relatively lower costs, are scalable, and make it more feasible to pair teachers with coaches who have expertise in their content area and grade level. Results from our randomized field trial document sizable and sustained effects on both teachers’ ability to analyze instruction and on their instructional practice, as measured by the Mathematical Quality of Instruction instrument and student surveys. However, these improvements in instruction did not result in corresponding increases in math test scores as measured by state standardized tests or interim assessments. We discuss several possible explanations for this pattern of results.

Serum somatotropin concentrations in Holstein heifers administered growth hormone-releasing factor and somatostatin

1998 ◽  
Vol 66 (3) ◽  
pp. 551-556 ◽  
Author(s):  
G. W. Kazmer ◽  
S. A. Zinn
Keyword(s):  
Growth Hormone ◽  
Body Weight ◽  
Early Identification ◽  
Response Curve ◽  
Dairy Calves ◽  
Production Traits ◽  
Individual Animal ◽  
Milk Production Traits ◽  
Serum Growth Hormone ◽  
Blood Samples

AbstractDose-response experiments were designed to determine the dosage of somatostatin (SRIF) necessary to alter serum growth hormone (GH) response to administration of GH-releasing factor (1·44; GRF) in cattle. The objective of this experimentation was to develop a GRF/SRIF challenge model that might be useful in early identification of animals which are genetically superior for milk production traits. In experiment 1, calves received either 0, 5 or 10 /JLg GRF per 100 kg body weight (BW) or GRF 1·29 at 1 ug per 100 kg BW. Both the 5 and 10 ug GRF per 100 kg BW dosages increased GH concentrations (P < 0·05). In experiment 2, animals received 3 ug GRF per 100 kg BW concurrent with administration of 0, 0·5, 1 or 2 ug SRIF per 100 kg BW at 0 min, with second dosage of GRF at +120 min. Administration of SRIF in those dosages did not alter GH response to GRF. In experiment 3, animals received 5 ug SRIF per 100 kg BW at -2, -1, 0 or +1 min relative to 3 ug GRF per 100 kg BW, with a second GRF injection at +120 min. No differences (P < 0·05) were found in response due to timing of SRIF administration. In experiment 4, animals were administered 0, 5, 10 or 20 Xg SRIF per 100 kg BW concurrent with 3 ug GRF per 100 kg BW. SRIF delayed (P < 0·05) the occurrence of maximum GH concentrations but did not affect the maximum concentration nor the area under the GH response curve (AUC) following either the first or second GRF injection. Utilizing data from experiment 4, individual animal response to GRF was reasonably consistent, as repeatabilities of AUCs for 1 h following first and second GRF injections were 0·80 and 0·65, respectively. Furthermore, sufficient among-animal variation existed so that animals could be distinguished from each other. Thus we conclude the method described herein might be useful in identifying superior dairy calves but accuracy would potentially be enhanced by collecting blood samples more frequently during the 20 min immediately after GRF injection.

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