In the past, cancer survivors tended to be most concerned about disease recurrence and treatment side effects. As survival rates have increased, however, patients are now also concerned about quality-of-life issues such as preserving fertility potential. It is well known that cancer treatment adversely affects male fertility via direct effects on the testis and/or through the endocrine glands. ...

The fertility potential of an artificial insemination (AI) dose is a function of the quantity, quality and health status of the semen contained therein. Therefore, identification of additional semen quality attributes associated with fertility could provide more accurate methods to predict, manage and select for AI sire fertility of predicting a bull's fertility rat. The objective of this study...

Nuclear DNA damage in spermatozoa could potentially have a major impact on the fertilizing capacity of these cells, their ability to establish a normal pattern of embryonic development as well as the health and wellbeing of subsequent offspring. Many laboratory techniques have been developed to assess this damage focusing on strand breaks, chromatin stability following exposure to extreme pH co...

Cholesterol, being the starting point of steroid hormone synthesis, is a long known modulator of both female and male reproductive physiology especially at the level of the gonads and the impact cholesterol has on gametogenesis. Less is known about the effects cholesterol homeostasis may have on postgonadic reproductive functions. Lately, several data have been reported showing how imbalanced c...

To explore the impact of comprehensive utilization straw resources on green agricultural development in Yantai, this thesis comprehensively analyzes crop and Yantai recent five years according to Statistical Yearbook (2017-2021), which estimates number assesses potential fertilizing biogas during that period Yantai. Moreover, reasonable suggestions are put forward for future based its current s...

Rats were surgically made bilaterally cryptorchid and after 4-8 days the testes were returned to the scrotum. After 70 days fertility was tested by pairing with females. Fertility was restored in 5/6 rats with testes cryptorchid for 4 or 5 days, but only 2/9 were fertile when the duration of cryptorchidism was 6-8 days. The sterility was due to irreversible degeneration of the spermatogonial st...

Because of the high concentration of nutrients in human urine, its utilization as an organic fertilizer has been notable throughout history. However, the nitrogen compounds in urine are not stable. Therefore, to convert urine into a suitable fertilizer, it is important to stabilize and adjust unstable nitrogen compounds such as ammonia. Because nitrification can influence the nitrogen profile, ...

HE theoretical aspects of diploid populations where all reproduction is by self-fertilization have been considered by several workers (ANDERSON and KEMPTHORNE 1954; COCKERHAM 1954,1963 ; HORNER, COMSTOCK and ROBINSON 1954; DEMPSTER 1955; KEMPTHORNE 1956, 1957, 1963; HORNER and WEBER 1956; GATES, COMSTOCK and ROBINSON 1957; HANSON and WEBER 1961). Several of these papers have indicated parametri...

Little is known about the reproductive behaviors and the actual outcomes of mating attempts in the gopher tortoise (Gopherus polyphemus). We examined the mating system and reproductive behaviors of a population of gopher tortoises in central Florida. Using microsatellite markers, we assigned fathers to the offspring of seven clutches and determined that multiple fathers were present in two of t...

Reproductive-isolating mechanisms between nascent species may involve sperm-egg recognition and have been best described in externally fertilizing organisms where such recognition is essential in preventing undesirable fertilizations. However, reproductive barriers in internally fertilizing species differ in significant ways, and a direct role for sperm-egg interactions has yet to be demonstrat...