An assessment of reproductive wastage in sheep.

An assessment of reproductive wastage in sheep. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

An assessment of reproductive wastage in sheep. Abstract Text:

T Willingham,M Shelton,P Thompson,

Reproductive wastage was evaluated by relating ovulation rate to lambs born or raised in range finewool ewes over a ten-year period. The results indicate that reproductive losses are of large magnitude and that these losses are concentrated in the period of ovulation to implantation and in death losses of lambs born. In this study, 33.5% of the potential lamb crop was lost in the early period. Multiple ovulating ewes showed the greatest embryonic loss. The data do not deviate from the binomial distribution, thus suggesting that these losses are largely due to chance. Further work is indicated in the first seventeen days after ovulation to examine losses due to fertilization failure, chromosomal abnormalities, and implantation failure. Abortion or absorption of the fetus was indicated in only 4% of the ewes sampled. An average of 16% of the potential lamb crop was lost from birth to weaning, with 73% of these losses occurring in the first few weeks. Management practices need to be developed to reduce these losses, and these would be expected to vary from one producer to the next depending on conditions. Increasing ovulation rate is one possible method of improving reproductive efficiency, as results of this study indicate that for each unit increase in ovulation rate, there is an increase of 0.52, 0.46, 0.33, and 0.23 in the average number of embryos surviving, lambs born, lambs marked and lambs weaned, respectively.

An assessment of reproductive wastage in sheep. Publishing Authors By Initials

T Willingham,M Shelton,P Thompson,

For similar abstracts research abstracts see: abstracts research

PUBMED ID PMID:

MEDLINE DATE:

An assessment of reproductive wastage in sheep. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Theriogenology

VOLUME: 26

Page Numbers: 179-88

Journal Abbreviation: Theriogenology

ISSN: 0093-691X

DAY: 26

MONTH: Aug

YEAR: 1986

An assessment of reproductive wastage in sheep. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 421510

An assessment of reproductive wastage in sheep. Keywords Mesh Terms:

KEYWORDS:

MESH TERMS:

Chemical & Substance for Abstract: An assessment of reproductive wastage in sheep. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for An assessment of reproductive wastage in sheep.

AFFILIATION: Texas A&M University Texas Agricultural Experiment Station San Angelo, Texas, USA.

Country: United States

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: Theriogenology

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

An assessment of reproductive wastage in sheep Related Publications

• A preliminary study of growth, serum prolactin and reproductive performance of beef heifers grazing Acremonium coenophialum -infected tall fescue.
• An assessment of reproductive wastage in sheep.
• Analysis method for measuring submicroscopic distances with blinking quantum dots.
• Calibration and Application of an X-ray Image Intensifier/ Charge-Coupled Device Detector for Monochromatic Macromolecular Crystallography.
• Cardiovascular dysfunction in dogs associated with critical illnesses.
• Changes in health for the uninsured after reaching age-eligibility for Medicare.
• Decremental effects of context exposure following delay eyeblink conditioning in rabbits.
• Developmental ability of in vitro matured sheep oocytes collected during the nonbreeding season and fertilized in vitro with frozen ram semen.
• Dynamic mapping of normal human hippocampal development.
• Effect of calf removal on serum luteinizing hormone and cortisol concentrations in postpartum beef cows.
• Effect of fluid irrigation on core body temperature during laparoscopic common bile duct exploration.
• Effect of suckling on cortisol, progesterone and luteinizing hormone in postpartum beef cows.
• Effects of progesterone or estradiol on uterine tubal transport of ova in the cow.
• Flare Associated with LHRH-Agonist Therapy.
• Identification and characterization of RTVP1/GLIPR1-like genes, a novel p53 target gene cluster.
• Improving estimates of genetic maps: a maximum likelihood approach.
• Influence of mineral supplementation on bovine serum, liver and endometrium at Day 1 and Day 12 of the estrous cycle.
• Multipoint linkage analysis with many multiallelic or dense diallelic markers: Markov chain-Monte Carlo provides practical approaches for genome scans on general pedigrees.
• Muscle glycogen repletion in 3 breeds of young cattle is not affected by energy intake.
• Nautiloid growth rhythms and lunar dynamics (reply).
• Predictors of prolonged dysphagia following acute stroke.
• Preventing injuries in rural Canada.
• Prostate cancer detection strategies.
• Semantic distance norms computed from an electronic dictionary (WordNet).
• Spermatogenesis, testicular composition and the concentration of testosterone in the equine testis as influenced by season.
• Synthesis, characterization, and pH-triggered dethreading of alpha-cyclodextrin-poly(ethylene glycol) polyrotaxanes bearing cleavable endcaps.
• TICKS (IXODOIDEA) OF MEDICAL AND VETERINARY INTEREST FROM BIRDS IN THE BRITISH ISLES.
• The future of antidepressant pharmacotherapy.
• Zinc depletion and complications of surgery.
• rag genes: novel components of the RamR regulon that trigger morphological differentiation in Streptomyces coelicolor.