Mongin P
Br Poult Sci. 1976 Sep;17(5):499-507. doi: 10.1080/00071667608416305.
Crop and gizzard contents were analysed at six stages of egg formation. 2. The crop was empty during the day and full during the night while the gizzard contained a constant amount of dry matter. The water content of the crop did not change but that of the gizzard was at a minimum just after the ovulation and at a maximum 18 h later. 3. The osmotic pressure of the gizzard contents remained constant and close to that of the blood; that of the crop contents was almost isotonic at oviposition but hypertonic 18 h later. In both organs the pH of the liquid phase varied cyclicly with the egg formation and was lowest during egg shell deposition. 4. The Na+, K+ and Cl- contents of the crop liquid phase did not vary but Ca2+ increased with decreasing pH.Na+ and K+ were also constant in the gizzard liquid phase but Cl- and Ca2+ increased during shell formation. 5. It is concluded that the amount of HCl secreted by the proventiculus is related to egg shell deposition and that calcium solubilisation depends on microbial fermentation in crop and HCl secretion by proventriculus.
在卵形成的六个阶段对嗉囊和砂囊内容物进行了分析。2. 嗉囊白天是空的，夜间是满的，而砂囊含有恒定数量的干物质。嗉囊的含水量没有变化，但砂囊的含水量在排卵后刚达到最低值，18小时后达到最高值。3. 砂囊内容物的渗透压保持恒定且接近血液渗透压；嗉囊内容物在产卵时几乎是等渗的，但18小时后是高渗的。在这两个器官中，液相的pH值随卵形成呈周期性变化，在蛋壳沉积期间最低。4. 嗉囊液相中的Na+、K+和Cl-含量没有变化，但Ca2+随着pH值的降低而增加。砂囊液相中的Na+和K+也保持恒定，但Cl-和Ca2+在蛋壳形成期间增加。5. 得出的结论是，前胃分泌的HCl量与蛋壳沉积有关，钙的溶解取决于嗉囊中微生物的发酵和前胃中HCl的分泌。
