بررسي تاثير مصرف بولوس كلسيم خوراكي پس از زايش درگاوهاي شيرده شكم دو: سلامت و عملكرد توليدي و توليد مثلي گاوهاي شيرده هلشتاين

Effect of Oral Calcium Supplementation in Second Parity Lactating Dairy Cows: Animal Health,Performance and Reproduction

در اين مطالعه مصرف بولوس كلسيم خوراكي در دوره پس از زايش بر عملكرد توليدي و تركيب شير، سلامت دام و برخي شاخص‌‌هاي توليدمثلي بر روي گاوهاي شكم دو صورت گرفت. بدين منظور 42 رأس گاو شيرده هلشتاين گزينش شده و به دو گروه كنترل (21 رأس، بدون مصرف بولوس كلسيم) و گروه درمان (21 رأس، 43 گرم بولوس كلسيم خوراكي بلافاصله پس از زايش) تقسيم شدند. نتايج نشان داد كه توليد و تركيب شير(چربي و پروتئين) و همچنين ميزان مقادير شمارش سلول‌‌هاي سوماتيك شير تحت تاثير تيمار آزمايشي بولوس كلسيم قرار نگرفت (05/0 P). بطور كلي مي‌‌توان با مديريت تغذيه مناسب در دوره خشكي از قبيل تبادل منفي كاتيون-آنيون جيره (DCAD)، بدون مصرف بولوس كلسيمي در دوره انتقال، سلامت و عملكرد توليدي و توليدمثلي گاوهاي شكم دو را بخوبي مديريت كرده و همچنين از افزايش هزينه‌‌ها جلوگيري به عمل آورد.

The present study was conducted to evaluate the effect of oral calcium supplementation in the postpartum period on milk production and composition, animal health and reproduvtive performance. For this purpose, forty-two Holstein lactating cows were selected and divided into two groups: control (twenty-one cows, without any calcium bolus) and treatment group (twenty-one cows,43 g oral bolus immediately after calving). The results showed milk yield and composition (fat and protein), and milk somatic cell count were not affected by oral calcium bolus. The incidence of impending diseases in this group of cows such as metritis, mating and abomasum reversal in the experimental group was lower than animals that did not consume calcium bolus (odds ratio (OR) = 0.13). It is also worth noting that in the case of reproductive indices, the mean of open days in the treatment group decreased compared to the control treatment but was not statistically significant. There was no difference in body condition score at the time of insemination in the control and treatment groups (P <0.05) and the mean number of inseminations per pregnancy in the treatment group was not significant compared to the control treatment (P <0.05). In general, with proper nutrition management during the close up with diet DCAD controling, it is possible to pass the transfer cows without consuming calcium bolus, and also to avoid increasing costs.