کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5520253 1544697 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Establishment of critical timing of progesterone supplementation on corpus luteum and embryo development in beef heifers
ترجمه فارسی عنوان
تعیین زمان بحرانی مکمل پروژسترون بر روی ژل کبد و رشد جنین در تلیسه های گوشت گاو
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم دامی و جانورشناسی
چکیده انگلیسی

Optimal concentrations of progesterone (P4) during early pregnancy are a major determinant of embryo survival in cattle. This study examined the effects of P4 supplementation, following a period of induced low P4, on corpus luteum (CL) development, circulating P4 concentrations and embryo development. A total of 107 beef heifers from one herd were used in the study. Following AI (Day 0) at a synchronized oestrus, heifers were randomly assigned to 1 of 5 treatment groups: (1) no subsequent treatment (control; n = 15); (2) administration of a synthetic prostaglandin F2α analogue (PG) on Days 3, 3.5 and 4 to induce low P4 and no further treatment (LP4; n = 23); administration of PG as above followed by P4 supplementation via insertion of a Controlled Internal Drug Release device from (3) Day 4-7 (P4 d4-7; n = 22); (4) Day 4-10 (P4 d4-10; n = 23); or (5) Day 7-10 (P4 d7-10; n = 24). Embryo and CL characteristics were determined following slaughter on Day 16. Embryo size was greater in heifers administered P4 d4-7 and P4 d4-10 in comparison with LP4. Corpus luteum area was significantly reduced in heifers administered P4 d4-7 and P4 d4-10 up to Day 7, and Day 10 (P4 d4-10), in comparison with LP4 heifers. Initiation of supplemental P4 on Day 7 had no effect on CL area or embryo size in comparison with LP4 heifers. Concentrations of P4 were less in P4 d4-7, P4 d7-10 and P4 d4-10 on Day 15 in comparison with LP4 heifers. The results of the study indicate an initiation and duration effect of supplemental P4 on circulating P4, embryo and CL development following induction of LP4 on Day 3 and 4.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Animal Reproduction Science - Volume 180, May 2017, Pages 1-9
نویسندگان
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