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Showing papers in "Theriogenology in 1976"


Journal ArticleDOI
TL;DR: An improved, non-surgical technique for recovering bovine eggs is described using modified Foley catheters, which shows good results for normal, unsuperovulated donors and poor results for donors with known fertility problems.

163 citations


Journal ArticleDOI
TL;DR: The age distributions for new cases of CIVDD by individual breeds showed a rapid rise to a peak at 4–6 years for high risk breeds, followed by a somewhat less rapid decline, and a peaked at 6–8 years for low risk breeds following by a gradual decline.

151 citations


Journal ArticleDOI
R.E. Erb1, H.A. Garverick1, R. D. Randel1, B.L. Brown1, C.J. Callahan1 
TL;DR: Asynchronies among nonfertile cases compared with fertile cases involved progesterone, LH, estrogens, and urinary estradiol-17beta prior to ovulation, and examples illustrative of abnormal hormonal profiles included ovarian cysts and early and late regression of the corpus luteum.

136 citations


Journal ArticleDOI
TL;DR: It is concluded that DXM suppresses the testosterone secretion and lowers LH release and therefore indirectly lowers the T synthesis and/or release.

86 citations


Journal ArticleDOI
TL;DR: Chromosomal analyses of 30 day-14 and four day-15 bovine embryos attempted from direct preparations of excised trophoblast cells prior to their surgical transfer singly to recipient heifers suggested that the ability to sex was related to an increased chance of embryo survival after transfer.

83 citations


Journal ArticleDOI
TL;DR: The uteri of 34 heifers were flushed for ova six to nine days following estrus using a single cannula nonsurgical technique and some ova were recovered in the 6th, 7th, and 8th flushes resulting in an apparent improved recovery index of 69%.

64 citations


Journal ArticleDOI
TL;DR: The intravaginal measurement of resistance of vaginal or cervical secretions seems to be a useful method for objectively determining estrus and offers opportunities for estrus determination, not only in single animals but in large populations under field conditions.

54 citations


Journal ArticleDOI
TL;DR: The serving capacity of a bull is an accurate measure of serving efficiency during pasture mating, and is related to the proportion of oestrous cows in its herd it served.

52 citations


Journal ArticleDOI
TL;DR: A simple, inexpensive, flexible, balloon catheter is described, as well as its use in the collection of embryos through the cervix in cattle, which has been modified by the extension of its tip.

50 citations


Journal ArticleDOI
TL;DR: A study of California dairy herds identified delayed first service and low conception rates as two of the major factors contributing to this problem.

49 citations


Journal ArticleDOI
TL;DR: The study indicates that Angus, Charolais, Horned Hereford and Polling Hereford bulls of breeding ages and weights should have scrotal circumference measurements of at least 32 centimeters in order to be classified as “Satisfactory Potential Breeders”.

Journal ArticleDOI
TL;DR: Clinopathologic features of normal and exhausted endurance horses were evaluated during conditions of severe heat and work stress, with results indicating that horses of Group B had a significant left shift in addition to the stress response.

Journal ArticleDOI
TL;DR: Little is known about bovine neutrophils in this regard and, particularly, in relation to mastitis, but the cow has a remarkable ability to adapt to a heavy daily loss of neutrophil in milk.

Journal ArticleDOI
TL;DR: Eight of ten and nine of ten cows given either GnRH and HCG responded to treatment and subsequent fertility was not different between the two groups, and pre-injection plasma levels of LH, progesterone, and estradiol were highly variable.


Journal ArticleDOI
TL;DR: Canine brucellosis is a disease that requires exceptional diagnostic skill beyond the ability to observe clumping of red-stained bacteria after mixing with a drop of serum on a slide, and requires periodic serologic and/or bacteriologic monitoring following treatment.

Journal ArticleDOI
TL;DR: The influence of lactation and three different hormone treatments were measured in fall lambing ewes and it is shown that by day 67 postpartum, considering lactation effect, 89% of nonlactating and 33 % of lactating eWes showed estrous behavior.


Journal ArticleDOI
TL;DR: Data show that suckling in buffaloes delayed the 1st postpartum ovulation and lengthened the period of time to the 1 first post partum heat.

Journal ArticleDOI
G. Ziv, I. Hartman1, E. Bogin, J. Abidar, A. Saran 
TL;DR: The two contro-lateral quarters of the udder of three cows were infused with Escherichia coli endotoxin and the composition of milk from the non-infused quarters remained essentially unchanged while the concentration of enzymes and milk sugar in the milk was measured.

Journal ArticleDOI
TL;DR: The results suggest that PGF 2α may be the treatment of choice for pyometra in cattle and due to its non-traumatic nature the PG-treatment has great advantages over the manual enucleation of the corpus luteum.

Journal ArticleDOI
TL;DR: Human chorionic gonadotrophin (HCG) was administered to some of the heifers in each trial in an attempt to improve pregnancy percentage, and pregnancy percentage in heifer receiving HCG was similar to that noted in the control heIFers or the placebo injected heifes while injection of estradiol 17β decreased the proportion of heifing which became pregnant.


Journal ArticleDOI
TL;DR: An assay method, based on the principle that cyanmet-hemoglobin is protected from acid denaturation when bound to haptoglobin, was evaluated and found to be well suited for haPToglobin determinations in horses, cats and dogs.

Journal ArticleDOI
TL;DR: Fertility was assessed from 28 to 45 day nonreturns to estrus and nonreturn rates (NRRs) were expressed as percentages for the various treatments and NRR was significantly depressed by dilution and by increasing amounts of egg yolk in the dilutent.

Journal ArticleDOI
TL;DR: A "Spanish" goat female was bred to a Barbados sheep ram and gave birth to twin offspring, one of each sex, and the F l female hybrid has goat-like characters and the coloration of the Barbados.

Journal ArticleDOI
TL;DR: Evidence of vertical (transplacental) transmission of Anaplasma marginale in pregnant heifers in the last trimester of gestation is provided.

Journal ArticleDOI
TL;DR: Serum levels of LH, total estrogen and progesterone were measured daily by radioimmunoassay during proestrus, estrus and early diestrus in five beagle bitches suggesting that LH release in the bitch is triggered by a sharp elevation in estrogen levels.


Journal ArticleDOI
E. Tolksdorff1, W. Jöchle1, D.R. Lamond1, E. Klug1, H. Merkt1 
TL;DR: Breeding of mares at the foal heat is desirable, but the low pregnancy rate and the not infrequent occurrence of subsequent anestrus are a deterrent.