Sentence examples for more sperm for from inspiring English sources

Lastly, the team found that if given a choice of two hens, roosters would spout more sperm for the one with the larger comb, which other research has linked to higher quality eggs.

That phenomenon has prompted a sexual arms race: Mammals such as chimps have evolved larger testicles to churn out more sperm, for instance, while some insects use part of their reproductive apparatus to scrape out enemy sperm before depositing their own.

Using the ancestral T. castaneum strain of our selection lines, Sbilordo et al. [ 47] found that well-fed males (flour with 10% yeast) provided the female with significantly more sperm for egg fertilization than starved males.

As sperm is considered to be a limited resource for precocious males during mating (Thomaz et al. 1997), larger gonad sizes (and thereby more sperm) for larger individuals may lead to higher fertilization rates.

In addition to selection for more sperm, postcopulatory sexual selection appears to select for higher quality sperm in the Maluridae.

As the demand for more sperm increases, so the investment in testicular tissue increases [11] [13].

Thus, it would be expected that the demand for more sperm is linked to larger testes size in spontaneous ovulators as found in this study.

In a natural mating system, SC is important for fertility (more sperm with larger testicles) [ 38].

Thus, the elevated male investment observed when female mating rate increases could potentially be driven by sperm competition to produce more sperm per ejaculate, or by the demand for more ejaculates.

Sperm can survive in his tubes for approximately this long, so although being neutered means that he cannot produce more sperm, he could still theoretically sire offspring for a short time post-castration.[17].[17]

Typically, each sample is divided into multiple vials, and the vials are sold for hundreds of dollars apiece. News reports and Internet tales abound of sperm donors who claim to have fathered dozens or even more than 100 babies via one or more sperm banks, but the stories are impossible to verify because there is no requirement that sperm-donor births be identified.