CONTROL OF THE OESTROUS CYCLE IN FRIESIAN HEIFERS WITH ICI 80,996
نویسندگان
چکیده
منابع مشابه
The effect of prostaglandin F2 alpha during various stages of the oestrous cycle of beef heifers.
The effects of prostaglandin F2\g=a\on peripheral plasma progesterone and oestrogen levels, incidence of oestrous cycle alteration, and fertility were examined in thirty beef heifers. The PGF2\g=a\was administered by insertion of an insemination pipette into the lumen of the uterus during three periods of the oestrous cycle: Days 3 to 5, Days 9 and 10, and Days 16 and 17. Oestrus occurred withi...
متن کاملEffect of oxytocin administration on the oestrous cycle of unilaterally hysterectomized heifers.
The effect of oxytocin administration on the oestrous cycle was studied in sixteen uterine-intact and thirty-two surgically prepared unicornual heifers. Unilateral hysterectomy was performed on Day 3 of the oestrous cycle and oxytocin or an equivalent volume of physiological saline was administered daily from Day 3 to Day 7 or 8. Oxytocin produced significantly shorter oestrous cycles in the in...
متن کاملThe influence of oestrous substances on cyclicity and oestrous behaviour in dairy heifers
BACKGROUND Declining fertility is a major concern for dairy farmers today. One explanation is shorter and weaker expression of oestrus in dairy cows making it difficult to determine optimal time for artificial insemination (AI). Chemical communication is of interest in the search for tools to detect oestrus or to synchronise or enhance oestrous periods. Pheromones, used in chemical communicatio...
متن کاملThe Oestrous Cycle and Its Control in Livestock
In nature it is the general rule that animals breed once annually and parturition occurs in the spring, the time most favourable to the progeny in that they grow up during the period of increasing light and warmth and also at the time when food for the mother is most abundant and adequate lactation is ensured. Under the conditions of feeding and housing provided by domestication the breeding se...
متن کاملControl of the mare's oestrous cycle by prostaglandins.
Several authors have recently demonstrated the luteolytic action of exogenous prostaglandin F2\g=a\(PGF2\g=a\)in various laboratory and domestic animals and there is now ample evidence that PGF2\g=a\is the uterine luteolytic hormone which terminates the life of the CL in many species (McCracken, 1972; McCracken, Carlson, Glew, Goding, Baird, Gr\l=e'\en & Samuelsson, 1972). In cattle, Rowson, Te...
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ژورنال
عنوان ژورنال: Annales de Biologie Animale Biochimie Biophysique
سال: 1975
ISSN: 0003-388X
DOI: 10.1051/rnd:19750232