THE INFLUENCE OF EXOGENOUS GROWTH HORMONE ON OVULATION RATE IN GILTS FED DIETS WITH DIFFERENT ENERGY AND PROTEIN CONTENTS

1989 ◽  
Vol 69 (1) ◽  
pp. 265-268 ◽  
Author(s):  
R. N. KIRKWOOD ◽  
P. A. THACKER ◽  
B. LAARVELD
Keyword(s):  
Growth Hormone ◽  
Key Words ◽  
Feed Intake ◽  
Dietary Treatment ◽  
High Energy ◽  
Ovulation Rate ◽  
Induced Ovulation ◽  
Exogenous Growth

Following pregnant mare's serum gonadotrophin (PMSG) induced ovulation, 61 Yorkshire × Landrace gilts were allocated to be fed either a control or a high-energy diet for 30 d. From 14 d, gilts on each dietary treatment received nine daily injections of porcine growth hormone or vehicle. Growth hormone depressed feed intake by 30% (P < 0.001), but did not influence ovulation rate. No influence of diet or growth hormone on the incidence of a subsequent ovulation was apparent. Key words: Gilts, diet, growth hormone, ovulation rate

THE INFLUENCE OF EXOGENOUS GROWTH HORMONE ON OVULATION RATE IN GILTS

1988 ◽  
Vol 68 (4) ◽  
pp. 1097-1103 ◽  
Author(s):  
R. N. KIRKWOOD ◽  
P. A. THACKER ◽  
A. D. GOONERATNE ◽  
B. L. GUEDO ◽  
B. LAARVELD
Keyword(s):  
Growth Hormone ◽  
Crude Protein ◽  
Ovulation Rate ◽  
Daily Injection ◽  
Corpora Lutea ◽  
Blood Samples ◽  
High Incidence ◽  
Exogenous Growth ◽  
Ad Libitum

A total of 32 prepubertal gilts of Yorkshire and Landrace breeding were selected at 138 d and fed ad libitum a 16.2% crude protein diet formulated to provide 13.1 MJ DE kg−1. From selection until the end of second estrus, the gilts were exposed to a boar for 30 min d−1 to facilitate the detection of pubertal and second estrous periods. From 14 d after puberty, the gilts received daily injections of either porcine growth hormone at 90 μg kg−1 body weight (GH; n = 20) or vehicle (CT; n = 12) until 24 h after the onset of second estrus and were then killed 9 d later to determine ovulation rate. Gilts not displaying a second estrus by 24 day after puberty were considered anestrus and the injection regime was halted. Anestrous gilts were killed 30–32 d after puberty and their ovaries examined for the presence of corpora albicantia and the absence of corpora lutea. Blood samples were obtained from all gilts at 14, 17, and 20 d after puberty. There was no treatment effect on the duration of the estrous cycle (20.8 vs. 21.3 d for GH and CT, respectively), but while all CT gilts cycled normally, only 55% of the GH gilts had a second estrus (P < 0.01). In those gilts having a second estrus, the daily injection of growth hormone increased ovulation rate (14.3 vs. 12.4 for GH and CT respectively; P < 0.03). Serum type 1 insulin-like growth factor (IGF-1) concentrations were higher (P < 0.001) in GH than in CT gilts, but there was no difference between cycling and anestrous GH gilts. We suggest that the effect of growth hormone on ovulation rate was mediated by increased secretion of IGF-1. The etiology of the high incidence of anestrus is, however, not known. Key words: Gilts, growth hormone, ovulation rate

EFFECT OF EXOGENOUS GROWTH HORMONE DURING THE FOLLICULAR PHASE ON hCG BINDING BY PORCINE LUTEAL TISSUE

1990 ◽  
Vol 70 (2) ◽  
pp. 719-721 ◽  
Author(s):  
R. N. KIRKWOOD ◽  
P. A. THACKER ◽  
B. L. GUEDO ◽  
B. LAARVELD
Keyword(s):  
Growth Hormone ◽  
Key Words ◽  
Ovarian Function ◽  
Binding Capacity ◽  
Follicular Phase ◽  
Corpora Lutea ◽  
Exogenous Growth ◽  
Luteal Tissue

From 14 d after puberty, 37 Yorkshire Landrace gilts received nine daily injections of porcine growth hormone (GH) or vehicle. Gilts were killed 10 d after the onset of their second estrus and their ovaries recovered. Treatment with GH resulted in an increase (P < 0.05) in the hCG binding capacity of the corpora lutea (0.17 vs. 0.11 nmol L−1 mg−1 protein). These data provide a possible mechanism whereby GH may influence ovarian function. Key words: Gilts, hCG binding, growth hormone

THE INFLUENCE OF EXOGENOUS GROWTH HORMONE ON ENDOCRINE STATUS AND THE OVULATORY RESPONSE TO PMSG IN PREPUBERTAL GILTS

1990 ◽  
Vol 70 (1) ◽  
pp. 309-312 ◽  
Author(s):  
R. N. KIRKWOOD ◽  
P. A. THACKER ◽  
R. S. KORCHINSKI ◽  
B. LAARVELD
Keyword(s):  
Growth Hormone ◽  
Key Words ◽  
Jugular Vein ◽  
Serum Concentrations ◽  
Blood Samples ◽  
Exogenous Growth ◽  
Endocrine Status ◽  
The Difference ◽  
To Receive ◽  
Surge Height

Twenty-three prepubertal Yorkshire × Landrace gilts were allocated to receive daily injections of either porcine growth hormone (pGH) or vehicle for 6 consecutive days. At the time of first pGH or buffer injection, all gilts received an injection of 500 IU PMSG. Blood samples were taken by jugular vein puncture at 0, 24 and 48 h then every 12 h until 96 h then every 8 h until 144 h. Samples were assayed for triiodothyronine (T3), insulin, glucose and LH. Treatment with pGH elevated (P < 0.01) serum concentrations of T3, insulin and glucose, and was associated with a reduced (P < 0.05) LH surge height. Fewer pGH-treated than vehicle-treated gilts ovulated (4/12 vs. 7/11), but the difference was not significant. Key words: Gilts, growth hormone, gonadotrophins, ovulation

BLOOD COMPOSITION IN HEREFORD AND ANGUS BULLS FROM LINES SELECTED FOR RAPID GROWTH ON HIGH-ENERGY OR LOW-ENERGY DIETS

1990 ◽  
Vol 70 (1) ◽  
pp. 305-307 ◽  
Author(s):  
C. B. BAILEY ◽  
J. E. LAWSON ◽  
G. J. MEARS
Keyword(s):  
Growth Hormone ◽  
Key Words ◽  
Rapid Growth ◽  
High Energy ◽  
Low Energy ◽  
Selection Effects ◽  
Blood Composition ◽  
Energy Substrates ◽  
Bull Calves ◽  
Low Energy Diet

Angus and Hereford bull calves were obtained from lines of cattle selected for 18 yr for rapid post-weaning gain on high-energy or low-energy diets. After weaning they were given a common diet consisting of 70% barley-based concentrate and 30% roughage. Bulls whose ancestors were selected on the high-energy diet had lower levels of cholesterol and albumin in the blood than bulls whose ancestors were selected on the low-energy diet. Blood insulin, growth hormone and energy substrates were not affected by differences in the nature of the selection diets and this accords with absence of effect of selection diet on rate, efficiency or composition of gain. The significance of the selection effects on cholesterol and albumin levels in blood is unknown. Key words: Angus, Hereford, bulls, blood, composition, selection

The effects of exogenous growth hormone on follicular steroid secretion and ovulation rate in sheep

1999 ◽  
Vol 17 (2-3) ◽  
pp. 269-277 ◽  
Author(s):  
R.J. Scaramuzzi ◽  
J.F. Murray ◽  
J.A. Downing ◽  
B.K. Campbell
Keyword(s):  
Growth Hormone ◽  
Ovulation Rate ◽  
Steroid Secretion ◽  
Exogenous Growth

DETERMINATION OF AFTER-RIPENING PERIOD AND HORMONAL RESPONSE OF OROBANCHE SOLMSII C.D. CLARKE SEEDS

1970 ◽  
Vol 11 (1) ◽  
Author(s):  
A. Bista ◽  
G. B. Khattri ◽  
B. D. Acharya ◽  
S. C. Srivastava
Keyword(s):  
Growth Hormone ◽  
Seed Germination ◽  
Key Words ◽  
Incubation Period ◽  
Seed Set ◽  
Summer Season ◽  
Conditioning Period ◽  
Root Parasite ◽  
One Year

To find out the ability of Orobanche seeds to germinate immediately after seed set, seeds were germinated periodically at an interval of three months for one year in GR24. Some Orobanche seeds were capable of germination immediately after seed set but most required about nine months as after ripening or incubation period to be able to germinate. The phenomenon of after ripening in Orobanche seeds could be taken as an ecological measure to dormant over following unfavorable wet summer season. The growth hormone studies on Orobanche seed germination have shown that GA3 at a concentration of 100 ppm substantially enhanced seed germination when applied during pre-conditioning period. NAA showed some stimulatory effect at 0.5 - 1.0 ppm when applied during post-conditioning period but the hormone if applied during pre-conditioning period inhibited the germination. Kinetin failed to stimulate the germination at all the concentrations tested. Key words: Germination, root-parasite, hormone. Ecoprint Vol.11(1) 2004.

scholarly journals Effects of Feeding Prepubertal Heifers a High-Energy Diet for Three, Six, or Twelve Weeks on Feed Intake, Body Growth, and Fat Deposition

2008 ◽  
Vol 91 (5) ◽  
pp. 1913-1925 ◽  
Author(s):  
L.E. Davis Rincker ◽  
M.S. Weber Nielsen ◽  
L.T. Chapin ◽  
J.S. Liesman ◽  
M.J. VandeHaar
Keyword(s):  
Feed Intake ◽  
High Energy ◽  
Fat Deposition ◽  
Body Growth

THE ACCUMULATIVE EFFECT OF FINNSHEEP BREEDING IN CROSSBREEDING SCHEMES: REPRODUCTIVE PERFORMANCE

1988 ◽  
Vol 68 (1) ◽  
pp. 69-81 ◽  
Author(s):  
MOHAMED H. FAHMY ◽  
JACQUES J. DUFOUR
Keyword(s):  
Body Weight ◽  
Mortality Rate ◽  
Key Words ◽  
Litter Size ◽  
Reproductive Performance ◽  
Conception Rate ◽  
Ovulation Rate ◽  
Genetic Groups ◽  
Linear Regressions ◽  
Size At Birth

Reproductive performance and body weight were studied on 361 ewes, representing Finnsheep (F), DLS (a population of 1/2 Dorset, 1/4 Leicester, 1/4 Suffolk) and seven combinations ranging from 1/8 to 7/8 Finnsheep breeding. Conception rate in yearlings was 61.5% for DLS compared to 89.0% for F with the crosses being intermediate. Conception rate in older ewes was similar in the different genetic groups (avg. 94%). Ovulation rate and litter size at birth of DLS ewes were 1.72 and 1.44 lambs, which was less than half those of F ewes (3.51 and 2.86 lambs, respectively). Both traits increased progressively with an increase in F breeding in crosses and with advances in age. DLS ewes weaned 1.22 lambs compared to 2.03 lambs for F ewes and 1.84 lambs for 4/8 F ewes. The heaviest litters at weaning (31.7 kg) were raised by 4/8 F ewes, followed by 7/8 F (30.8 kg) while those raised by DLS ewes weighed 23.0 kg and F ewes 29.1 kg. Percentage of ova lost per ewe mated averaged 24% and ranged between 18% (DLS and 1/8 F) and 29% (6/8 F). About 3.6% of lambs were born dead and a further 13.8% died before weaning. Preweaning mortality rate was highest in F (22.9%) and lowest in 3/8 F (9.4%). Average kilograms of lambs weaned per ewe exposed was highest in 4/8 F (27.6 kg) followed by F (26.0 kg), whereas that of DLS was the lowest at 18.1 kg. The 4/8 F cross showed 25% heterosis in kg of lambs weaned per ewe exposed and 52.5% increase over DLS. Significant positive linear regressions were calculated for ovulation rate, litter size and preweaning mortality rate on proportion of Finnsheep breeding in crosses. The relation was quadratic for percent ova lost and lamb mortality at weaning. Yearling DLS females weighted 36 kg compared to 44 kg for F yearlings. However, at 5 yr of age DLS ewes weighed 62 kg, 5 kg heavier than F ewes. The heaviest ewes at all ages were the 4/8 F (45 kg at 1 yr, 65 kg at 5 yr). Key words: Reproduction, DLS sheep, Finnsheep, crossbreeding, heterosis, repeatabilities

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