先寫重點：不同的pH值對於X和Y精子的數量並無影響
直接來看你引用的這篇論文
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6755399/#ref39
論文標題是這樣的
Effect of the pH in the enrichment of X or Y sex chromosome-bearing sperm in
bovine
環境pH值對於牛的X或Y精子的影響
我們直接看論文摘要的：結果
Results:
The abundance of X- and Y-bearing spermatozoa was not differed significantly
in either of the fraction collected.
結果是不同的pH值對於X和Y精子的數量並無影響
像你這樣斷章取義不知道是做何居心
本論文在討論的部分也已經明確寫了：本實驗未發現不同pH值會影響X和Y精子的量
In human, researcher has observed that the Y-chromosome-bearing spermatozoa
were more vulnerable to fluctuations in physiological and sperm storage
conditions than X-chromosome-bearing spermatozoa [42]. Hence, we have used
different pH to check the enrichment of either X- or Y-chromosome-bearing
spermatozoa in the respective fraction. However, we could not find any
significant skewness in X- and Y-chromosome-bearing sperm population.
本研究未找到X和Y精子在不同的pH中有任何數量上的明顯差異
※ 引述《mick001 (:D)》之銘言：
: It has been observed that at the time of fertilization, the pH of the vagina
: may play a role in the selection of X- or Y-bearing sperm and thereby affects
: the sex of the offspring [37]. The pH of the vagina is moderately acidic
: which varies from 3.8 to 4.5 [38]. Thus, studies have been done and patented,
: wherein sperm cells were put in an environment having physiological pH and at
: the same time contacting the sperm cells with at least one extra
: subenvironment with differing pH to enrich the population of specific type of
: sperm cells.
: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6755399/#ref39
: 據觀察，在受精時，陰道的酸鹼度
: 可能在選擇含 X 或 Y 的精子中發揮作用，從而影響
: 後代的性別 [37]。陰道的酸鹼度為中度酸性
: 從 3.8 到 4.5 [38] 不等。因此，已經完成研究並獲得專利，
: 其中精細胞被置於具有生理 pH 值的環境中，並且在
: 同時與至少一個額外的精子細胞接觸
: 具有不同 pH 值的亞環境以豐富特定類型的種群
: 精子細胞。
: https://i.imgur.com/1goLAut.png
: 科學上，ph值對於x/y精子的生存有極大影響。
: 想問一下版上有兩位以上只有同性別寶寶的爸媽的飲食習慣！
: 推文格式範例：
: 兩男，父肉食，母素食。
: 三女，父素食，母肉食。
: 感謝大家回覆～