Detection of Early Pregnancy in Caribou: Evidence for Embryonic Mortality

1998 ◽  
Vol 62 (3) ◽  
pp. 1066 ◽  
Author(s):  
Don E. Russell ◽  
Karen L. Gerhart ◽  
Robert G. White ◽  
Debbie Van De Wetering
Keyword(s):  
Early Pregnancy ◽  
Embryonic Mortality

INTERRUPTION OF EARLY PREGNANCY IN THE RABBIT BY A SINGLE INJECTION OF OESTRADIOL CYCLOPENTYLPROPIONATE

1963 ◽  
Vol 26 (1) ◽  
pp. 133-NP ◽  
Author(s):  
G. S. GREENWALD
Keyword(s):  
Early Pregnancy ◽  
Reproductive Tract ◽  
Single Injection ◽  
Embryonic Mortality ◽  
Egg Transport ◽  
Embryonic Death

SUMMARY Female rabbits were injected i.m. with various doses of oestradiol cyclopentylpropionate (OECP) immediately after coitus. The percentage of embryonic deaths 8 days post coitum after a single injection of 25, 50, 100 or 250 μg. of OECP was, respectively, 86, 97, 100 and 100%. However, the cornua of rabbits receiving as much as 100 μg. of OECP had normal 3 to 4 + progestational proliferation 8 days after mating. The high embryonic mortality resulted from disturbances in the rate of egg transport through the oviduct. Thus, with 25 μg. OECP most of the ova were expelled from the reproductive tract 48 hours post coitum, whereas with 250 μg ova were retained at the ampullary-isthmic junction of the tube for at least 5 days. Under these circumstances, small viable blastocysts developed in 4 days, but 24 hr. later all eggs were degenerating. These experiments suggest that embryonic death indirectly results from administration of OECP and that the hormone only briefly disrupts postovulatory development of the reproductive tract.

scholarly journals Pregnancy-specific protein B, progesterone concentrations and embryonic mortality during early pregnancy in dairy cows

Reproduction ◽  
1988 ◽  
Vol 83 (1) ◽  
pp. 215-223 ◽  
Author(s):  
P. Humblot ◽  
S. Camous ◽  
J. Martal ◽  
J. Charlery ◽  
N. Jeanguyot ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Early Pregnancy ◽  
Specific Protein ◽  
Embryonic Mortality ◽  
Protein B

scholarly journals Relation between nutrition and fertility in pigs.

1980 ◽  
Vol 28 (4) ◽  
pp. 211-227 ◽  
Author(s):  
L.A. den Hartog ◽  
G.J.M. van Kempen
Keyword(s):  
Energy Intake ◽  
Early Pregnancy ◽  
Protein Intake ◽  
High Energy ◽  
Low Energy ◽  
Embryonic Mortality ◽  
Ovulation Rate ◽  
High Energy Intake ◽  
Suitable Sequence

A review of experiments on the effect of energy and protein intake on fertility in gilts suggested that a high energy intake shortly before oestrus (flushing) increased ovulation rate. Although high energy intake gave more ovulations than low energy intake, embryonic mortality was greater. The most suitable sequence during rearing, flushing and early pregnancy seemed to be low, high and low energy, respectively. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Circulating Progesterone Concentrations in Cows during Early Pregnancy and Embryonic Mortality Condition

2018 ◽  
Vol 7 (07) ◽  
pp. 1448-1454
Author(s):  
Pinki Rani ◽  
R.K. Chandolia ◽  
Ravi Dutt ◽  
Nitin Soni ◽  
Anand Kumar Pandey ◽  
...  
Keyword(s):  
Early Pregnancy ◽  
Embryonic Mortality

EMBRYONIC MORTALITY AND DEVELOPMENT DURING EARLY PREGNANCY IN THREE BREEDS OF SWINE WITH PUREBRED AND CROSSBRED LITTERS

1975 ◽  
Vol 55 (1) ◽  
pp. 9-15 ◽  
Author(s):  
J. J. DUFOUR ◽  
M. H. FAHMY
Keyword(s):  
Litter Size ◽  
Early Pregnancy ◽  
Uterine Horn ◽  
Embryonic Mortality ◽  
Ovulation Rate ◽  
Corpora Lutea ◽  
Placental Membranes

Data on ovulation rate, litter size, fetal and placental weights and weight and length of uterine horns were taken at 23, 42 or 63 days of pregnancy on 138 Yorkshire, Landrace and Lacombe multiparous sows bred to Yorkshire, Landrace and Hampshire boars to produce purebred and crossbred litters. Of the 53 Yorkshire sows slaughtered, 13.2% were non-pregnant, compared to 7.5 and 8.5% for the Landrace and Lacombe sows, respectively. The average number of corpora lutea was 15.1 in Landrace, one more than in Lacombe and Yorkshire sows. Embryonic mortality in crossbred litters was 7.5 and 6.0% higher in Landrace sows than in Yorkshire and Lacombe sows, respectively. In purebred litters, it was 8.4% higher in Landrace than in Yorkshire. Litters sired by Yorkshire boars were 7.8% larger in number than those sired by Landrace or Hampshire boars. At 23 days of pregnancy, 19% of the ova released in the three breeds were lost. A further loss of 4% was noted at later stages. The weights of Landrace and Lacombe embryos were significantly (P < 0.05) heavier than those of Yorkshire at the 3 days of pregnancy studied. Crossbred embryos of Yorkshire and Landrace were heavier than purebreds by 27, 8 and 6% at the 23, 42 and 63 days of pregnancy, respectively. Weights of the uterine horns and placental membranes were heavier in Landrace and Lacombe than in Yorkshire sows. Little difference was found between Landrace and Lacombe breeds in embryonic, placental and uterine weights. Highly significant correlations (r = 0.65, 0.57 and 0.76) were found between placental and embryonic weights at the 3 days of pregnancy. Correlation between number of viable embryos and length of uterine horn was 0.30 and that with weight of horn was 0.10.

Sexual Abuse and Early Pregnancy in Young Women's Lives

1995 ◽  
Vol 40 (9) ◽  
pp. 889-890
Author(s):  
Valerie J. Steffen
Keyword(s):  
Sexual Abuse ◽  
Early Pregnancy ◽  
Women's Lives
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