Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 128 for “"estrous"”.
-
Ascorbic acid and the reproductive cycle : ascorbic acid and the estrous cycle
Thesis (M.S.)--Michigan State University. Dept. of Food Science and Human Nutrition, 1974
-
Hormonal, environmental, nutritional and lactational interrelationships with estrous behavior and conception in dairy cattle
… and environmental factors which may affect estrous behavior and conception rate. All cattle were observed for estrous activity twice daily between 0800 to 1000 hr (am) and 2000 to 2200 hr (pm). Breedings were made at the first observation of estrus (0 hr) or following the next heat check (12 …
-
Prostaglandins Modulate the Uterine Response to Infectious Bacteria in Postpartum and Estrous Cyclic Ewes
The uterine immune system is down regulated when exposed to P4. Five experiments were conducted to determine the in vivo and in vitro role(s) of P4 and prostaglandins in immune function(s) associated with uterine infections. In Exp. 1, postpartum ewes (d 0 = parturition) were supplemented with …
-
Strategies to improve fertility of Bos taurus beef females enrolled in estrous synchronization protocols
Estrous synchronization (ES) protocols enhances profitability of beef cow-calf operations by improving percentage of cows pregnant early in the breeding season and increasing kg of calf weaned per cow exposed. Many factors, however, influence the fertility of cattle enrolled to ES protocols. The …
-
Determination of an Estrous Cycle in Female Giraffes (Giraffa Camelopardalis) By Radioimmunoassay of Fecal Hormones
… Fecal analysis proved useful in detecting the estrous cycle and pregnancy, and has the benefit of being a non-invasive procedure.
-
Effects of prenatal androgen exposure on postnatal growth, estrous cyclicity and behavior in female beef cattle
… periods, of gestation on the external genitalia, estrous cyclicity, postnatal growth, social dominance and sexual behavior of female beef cattle. Pregnant cows received 17a methyl-testosterone (250 mg/d, sq) on d 40 to 100 (group 1), 70 to 130 (group 2) or 100 to 160 (group 3) of gestation. …
-
Effects of breed and ram exposure on Spring estrous behavior and Summer fertility in domestic ewes
… for progesterone (P4) content as an indicator of estrous activity. All rams were fitted with crayon equipped marking harnesses for use as an indicator of mating behavior in ewes. The first study tested the effects of introduction of vasectomized rams into a flock: of' 50 Dorset (D) and 50 …
-
Variation in Social Behavior Throughout the Estrous Cycle of a Captive Killer Whale <i>Orcinus orca</i>
… The present study examined the influence of the estrous cycle of a captive female killer whale on the rate, duration, initiation and reception of social behavior she performed with her only pool mate, a male Atlantic bottlenose dolphin. Although these two delphinid species do not commonly …
-
Changes in vaginal microbiome of beef cows enrolled in estrous synchronization protocols and its relation to fertility
Estrus synchronization (ES) is a valuable technology that can help beef cow-calf producers to overcome infertility caused by prolonged anestrus. Protocols for ES that use progesterone (P4) supplementation are of particular value to cows with prolonged postpartum anestrus as P4 triggers them to …
-
Evaluation of the Hypothalamic Kisspeptin System Throughout the Estrous Cycle and During the Attainment of Puberty in Gilts
… kisspeptin system throughout various days of the estrous cycle and 2) the hypothalamic kisspeptin system during the peripubertal period in gilts. In experiment 1, 40 crossbred gilts (191 d, 121 kg) were administered an intramuscular injection of PG600. Twelve days after the administration of …
-
Relationship Between Physical Activity, Stage of Estrous Cycle, Sexual Behavior and Plasma Luteinizing Hormone in Dairy Cattle (Electronic Pedometers)
Detection of estrus remains as one of the major factors affecting reproductive performance in dairy cattle. Use of electronic equipment such as programmable electronic pedometers may assist detecting changes in physical activity that occur during the day of estrus in cattle.
-
Disrupted female reproductive cyclicity and gonadotropin-releasing hormone neuron dysfunction in a mouse model of temporal lobe epilepsy
… 60% percent of KA-injected mice showed disrupted estrous cycles, typically characterized by increased estrous cycle length and increased time spent in diestrus estrus by 42 days post-KA injection. Hypothalamic gonadotropin-releasing hormone (GnRH) neurons are key players in the neural control of …
-
Evaluation of uterine lumenal proteins in dairy cattle at known stages of the estrous cycle and in ovarian steroid treated ovariectomized cows
The uterine protein milieu of cyclic and ovariectomized (ovx) cows treated with estradiol-17S (E-2) and progesterone (P) alone or in combination was studied by various biochemical methods. Uterine lumenal fluids (UF) were collected nonsurgically via a foley catheter. Sephacryl S-200 chromatography …
-
Role of Endogenous Dopamine in Regulation of Anterior Pituitary Hormone Secretion During Early Postpartum and Various Stages of the Estrous Cycle in Holstein Cows
… postpartum period and various stages of the estrous cycle was investigated in Holstein cows. Experiment 1 was conducted in anovulatory early postpartum cows. Fluphenazine caused a decrease (P < .05) in mean serum LH concentration and LH pulse frequency. Likewise, FLU caused a (P < .05) …
-
Prostaglandin metabolism in the ovine corpus luteum
… mechanisms allow the corpus luteum early in the estrous cycle and early in pregnancy to be resistant to the luteolytic activity of PGF2α?". Two potential mechanisms were addressed, decreased synthesis of PGF2α and catabolism of PGF2α in the corpus luteum. The first hypothesis tested was: "PGDH …
Page 1 of 7