scholarly journals Effects of combined treatment with recombinant bovine somatotropin and immunization with live oocysts on performance of broiler chicks raised in coccidia-seeded floor pens

1997 ◽  
Vol 76 (10) ◽  
pp. 1349-1354
Author(s):  
P.C. Allen ◽  
H.D. Danforth
Keyword(s):  
Combined Treatment ◽  
Bovine Somatotropin ◽  
Broiler Chicks ◽  
Recombinant Bovine Somatotropin

Recombinant bovine somatotropin increases milk yield and calf gain in diverse breeds of beef cattle: associated changes in hormones and indices of metabolism.

1995 ◽  
Vol 73 (10) ◽  
pp. 3051 ◽  
Author(s):  
J D Armstrong ◽  
R W Harvey ◽  
M A Poore ◽  
R B Simpson ◽  
D C Miller ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Milk Yield ◽  
Bovine Somatotropin ◽  
Recombinant Bovine Somatotropin

Recombinant bovine somatotropin: association with reproductive performance in dairy cows

1999 ◽  
Vol 52 (3) ◽  
pp. 481-496 ◽  
Author(s):  
L.J. Judge ◽  
P.C. Bartlett ◽  
J.W. Lloyd ◽  
R.J. Erskine
Keyword(s):  
Dairy Cows ◽  
Reproductive Performance ◽  
Bovine Somatotropin ◽  
Recombinant Bovine Somatotropin

scholarly journals Pre- and post-weaning injections of bovine somatotropin to optimize puberty achievement of Bos indicus beef heifers1

2018 ◽  
Vol 3 (1) ◽  
pp. 443-455 ◽  
Author(s):  
Philipe Moriel ◽  
Bruno Ieda Cappellozza ◽  
Matheus B Piccolo ◽  
Reinaldo F Cooke ◽  
Miguel F Miranda ◽  
...  
Keyword(s):  
Mrna Expression ◽  
Average Daily Gain ◽  
Bos Indicus ◽  
Bovine Somatotropin ◽  
Brachiaria Decumbens ◽  
Blood Samples ◽  
Recombinant Bovine Somatotropin ◽  
Liver Biopsies ◽  
Liver Gene ◽  
To Receive

Abstract The present study evaluated the growth and puberty attainment of Bos indicus heifers administered recombinant bovine somatotropin (bST) or saline injections during preweaning and/or postweaning. On day 0, 177 suckling Nellore heifers were stratified by initial age and body weight (BW) (80 ± 10 d; 97 ± 16 kg), and randomly assigned, in a 2 × 2 factorial design (n = 44 to 45 heifers/treatment), to receive s.c. injections of saline (5 mL 0.9% NaCl) or sometribove zinc (Posilac; Elanco, Greenfield, IN; 6.14 mg/kg of BW0.75) on days 0 and 10 (PRE) and/or days 167 and 177 (POS). All heifers were managed as a single group in Brachiaria decumbens pastures from day 0 until 24 d postweaning (day 191), and then provided a corn silage–based TMR from days 191 to 380 to achieve 65% to 70% of mature BW at the end of the study (day 380). Heifer full BW was collected on days 0, 10, 167, 177, and monthly from days 191 to 380. Transrectal ultrasonography of ovaries was performed on days 1 and 10 of each month from days 229 to 380 to assess the percentage of pubertal heifers. Liver biopsies and blood samples from jugular vein were collected on days 0, 10, 167, 177, and 380. Additional blood samples were collected monthly from days 259 to 380 (n = 10 to 15 heifers/treatment). No interactions among day of the study, PRE, and POS injections of saline or bST were detected (P ≥ 0.11). Preweaning bST injections increased heifer average daily gain (ADG) from days 0 to 10 and plasma IGF-1 on day 10 (P ≤ 0.03), did not affect ADG from days 0 to 177, plasma IGF-1 from days 259 to 380, and any liver gene mRNA expression (P ≥ 0.19), but tended to decrease ADG from days 191 to 380 (P = 0.07) and percentage of pubertal heifers on days 349 (P = 0.07), 359 (P = 0.002), and 380 (P = 0.0001) compared with saline injections. Postweaning bST injections increased plasma IGF-1 on day 177 and overall liver mRNA expression of GHR-1A (P ≤ 0.05), decreased plasma IGF-1 from days 259 to 380 (P = 0.03), tended to decrease liver mRNA expression of GHR-1B on day 177 (P = 0.08), but did not affect ADG from days 167 to 177 and 191 to 380, and puberty attainment from days 229 to 380 (P ≥ 0.12) compared with saline injections. Thus, preweaning and postweaning injections of bST successfully increased heifer plasma IGF-1 concentrations 10 d after first injection. Postweaning injections of bST had no impact on puberty attainment, whereas preweaning bST injections of bST impaired puberty attainment of Nellore beef heifers.

Impact of recombinant bovine somatotropin, progesterone, and estradiol benzoate on ovarian follicular dynamics in Bos taurus taurus cows using a protocol for estrus and ovulation synchronization

2019 ◽  
Vol 125 ◽  
pp. 331-334
Author(s):  
Ana Paula Kaminski ◽  
Maria Luisa Andrade Carvalho ◽  
Marcio Saporski Segui ◽  
Luiz Ernandes Kozicki ◽  
Victor Breno Pedrosa ◽  
...  
Keyword(s):  
Bos Taurus ◽  
Estradiol Benzoate ◽  
Bovine Somatotropin ◽  
Recombinant Bovine Somatotropin ◽  
Follicular Dynamics

Recombinant bovine somatotropin on heifer’s biometric measures, bodyweight, blood metabolites, and dry matter intake predictions

2018 ◽  
Vol 58 (12) ◽  
pp. 2207
Author(s):  
Jefferson R. Gandra ◽  
Euclides R. Oliveira ◽  
Caio S. Takiya ◽  
Tiago A. Del Valle ◽  
Erika R. S. Gandra ◽  
...  
Keyword(s):  
Sustained Release ◽  
Linear Model ◽  
Rectal Temperature ◽  
Bovine Somatotropin ◽  
Cholesterol Concentration ◽  
Blood Metabolites ◽  
Recombinant Bovine Somatotropin ◽  
Tropical Conditions ◽  
Haematological Profile ◽  
Non Linear

This study aimed to determine the influence of sustained-release recombinant bovine somatotropin (rbST) injections on biometrics measures, bodyweight (BW), average BW gain, observed and predicted DM intake, accuracy of recent methods to estimate DM intake, blood metabolites, haematological profile and rectal temperature in dairy heifers. Thirty Holstein heifers (132 ± 27 kg BW and 6.2 ± 0.35 months of age) were used in a complete randomised design experiment. Heifers were assigned to treatments: (1) Control (CON), 250 mL of saline solution, or (2) rbST, 250 mg of sustained-release rbST every 15 days. Treatments were injected in the subcutaneous of ischiorectal fossa or subscapular region in a regular alternating manner (right and left side) every 15 days throughout a period of 90 days. Prediction of DM intake was calculated using either non-linear or linear models for heifers in tropical conditions. rbST injections increased the average values of thoracic perimeter, length, and rump width in heifers. rbST-treated heifers had higher average BW and BW gain than CON. Regardless of the model applied, both observed and predicted DM intake were higher for heifers rbST-treated in relation to CON. Non-linear model was accurate without significant bias. rbST injections elevated blood glucose and high-density lipoprotein cholesterol concentration in heifers. No differences were detected on haematological profile and rectal temperature of heifers. rbST injections every 15 days to growing heifers promoted animal performance by increasing biometrics measures and BW gain. In addition, non-linear model was accurate to predict DM intake of heifers.

scholarly journals Effect of growth hormone on milk yield and reproductive performance of subfertile Holstein cows during extended lactations

2019 ◽  
Vol 17 (1) ◽  
pp. e0403 ◽  
Author(s):  
Jessica Flores ◽  
José E. García ◽  
Jesús Mellado ◽  
Leticia Gaytán ◽  
Ángeles De Santiago ◽  
...  
Keyword(s):  
Milk Yield ◽  
Reproductive Performance ◽  
Bovine Somatotropin ◽  
Holstein Cows ◽  
Control Group ◽  
Recombinant Bovine Somatotropin ◽  
Northern Mexico ◽  
Lactation Length ◽  
Hot Environment ◽  
Farm Efficiency

The objective of this study was to determine the effects of the administration of recombinant bovine somatotropin (rbST) throughout lactation to high-yielding subfertile (conception > 270 days postpartum) Holstein cows undergoing extended lactations (≥480 d) on milk production and reproductive performance. The study used two large adjacent commercial herds with similar management in a hot area of northern Mexico (25° N). Cows in one herd (n=2341) received a 500-mg dose of rbST every 14 d until dried off, starting 60 days postpartum. The other herd served as control (n=984). Across parity, rbST-treated cows produced 20% greater milk yield than control cows in 305-d lactations. Across parities, milk yield from 305 d postpartum to the end of lactation was 2734 kg higher in rbST-treated cows than control cows. Across parities rbST-treated cows produced 4777 more kg of milk during the entire lactation (mean 605 d) than the control group (mean 572 d). Conception rates (CR) at first service were only 3.2% and 5.9% (p<0.05) for control and rbST-treated cows, respectively. Overall CR was 43.5% and 61.6% (p<0.05) for control and treated cows, respectively. Control cows required 2.4 more (p<0.01) services per conception than rbST-treated cows. It was concluded that in this hot environment, the use of rbST suits dairy producers because it substantially improves both milk yield and reproductive performance in subfertile high-yielding Holstein cows. By markedly increasing lactation length and lactation persistency farm efficiency is greatly improved due to extended herd life.

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