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بررسی تغییرات آنیونی - کاتیونی جیره بر عملکرد شیردهی، شاخص های تولیدمثلی، اسیدهای چرب شیر و مواد معدنی سرم در گاوهای شیرده هلشتاین در تنش حرارتی | ||
| علوم دامی | ||
| مقاله 1، دوره 29، شماره 113، اسفند 1395، صفحه 3-16 اصل مقاله (984 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/asj.2017.109456 | ||
| نویسندگان | ||
| آناهیتا سیادتی؛ یدالله چاشنی دل* ؛ عیسی دیرنده | ||
| گروه علوم دامی، دانشکده علوم دامی و شیلات، دانشگاه علوم کشاورزی و منابع طبیعی ساری | ||
| چکیده | ||
| این پژوهش به‌منظور بررسی تاثیر سطوح مختلف تفاوت کاتیون-آنیون جیره (DCAD) بر عملکرد شیردهی، پروفیل اسیدهای چرب شیر، غلظت مواد معدنی پلاسما و ادرار طی تنش حرارتی انجام شد. در این پژوهش 18 راس گاو هلشتاین نوبت زایش سوم با میانگین تولید شیر 5/1±5/43 لیتر در قالب طرح کاملا تصادفی به‌صورت تصادفی به گروه‌های آزمایشی: (1) 200+ میلی اکی والان در کیلوگرم ماده خشک مصرفی (2) 330+ میلی اکی والان در کیلوگرم ماده خشک مصرفی و (3) 550+ میلی اکی والان در کیلوگرم ماده خشک مصرفی اختصاص یافتند. گاوها از روز زایش و بعد از 14 روز عادت‌دهی، سه هفته با گروه‌های بالا تغذیه شدند. نتایج نشان داد سطوح مختلف DCAD بر مقدار مصرف خوراک، تولید شیر و چربی شیر را تحت تاثیر قرار داد وبا افزایش سطح DCAD افزایش یافت (01/0 P <). بیشترین مقدار مصرف خوراک، تولید شیر، چربی شیر و pH خون و ادرار در سطح 550+ میلی اکی والان در کیلوگرم ماده خشک مصرفی بود. همراه با افزایش DCAD فشار نسبی دی اکسیدکربن و مقدار بی‌کربنات خون به‌صورت معنی‌داری کاهش یافت. افزایش سطح DCAD تفاوت کاتیون-آنیون جیره اسیدهای چرب کوتاه زنجیر (C4-C10) را کاهش داد (05/0 P <). به‌طور کلی نتایج پژوهش حاضر نشان داد تفاوت کاتیون-آنیون جیره‌ای در سطح 550+ میلی اکی والان در کیلوگرم ماده خشک مصرفی با افزایش مصرف خوراک، بهبود pH و افزایش قدرت بافری شکمبه سبب بهبود تعادل الکترولیتی بدن شد. همچنین سطح 550+ میلی اکی والان در کیلوگرم عملکرد تولیدی و تولیدمثلی گاوهای شیری را طی تنش حرارتی بهبود داد. | ||
| کلیدواژه‌ها | ||
| تفاوت کاتیون- آنیون؛ تنش حرارتی؛ عملکرد شیردهی؛ pH خون | ||
| عنوان مقاله [English] | ||
| Considering dietary cation-anion changes on lactation and reproductive performances, milk fatty acids profile and mineral concentrations of serum in lactating dairy cows during heat stress | ||
| نویسندگان [English] | ||
| A. Siyadati؛ Y. Chashnidel؛ E. Dirandeh | ||
| چکیده [English] | ||
| In order to survey the effect of three levels ofdietary cation-anion difference (DACD) on lactating performance, milk fatty acid profile, plasma and urine mineral concentration during heat stress. Eighteen Holstein cows (parity = 3, milk 43.5±1.5 Kg/d) were used in completely randomized design and randomly assigned into three treatments: (1) +20 DACD (mEq/kg DM), (2) +33 DACD (mEq/kg DM) and (3) +55 DCAD (mEq/kg DM). Cows were fed experimental diets for 35 days starting from calving. Results showed dry matter intake (P < 0.001), milk production (P < 0.001) and milk fat percentage (P < 0.001) affected by different levels of dietary cation-anion difference and was greatest in cows received +55 DCAD (mEq/kg DM). Maximum blood pH was found for cows fed +55 DCAD (mEq/kg DM, P < 0.03). Concentration or pressure pCO2 and HCO3 concentrations significantly declined with increasing DCAD. Increasing DCAD significantly affected short chain fatty acids (C4-C10) and C18 fatty acids. Concentration of C18 fatty acids in levels of +20, +33 and +55 DACD (mEq/kg DM) were 14.49, 19.66 and 15.87 respectively. In conclusion dietary cation-anion difference in +55 mEq/kg DM level improved productive and reproductive performances via increasing dry matter intake, improving pH and rumen buffering power and body electrolyte balance, during heat stress. | ||
| کلیدواژه‌ها [English] | ||
| Cation-anion difference, Heat stress, lactating performance, blood pH | ||
| مراجع | ||
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