Author: Stephan PurschkePublisher:
ISBN:
Category :
Languages : en
Pages : 29
Book Description
Effects of Suprabasal Progesterone Levels and Negative Energy Balance on Estrous Activity and Fertility in Dairy Cows
Author: Stephan PurschkeInfluence of Negative Energy Balance and Body Condition on Luteal Function and Estrous Behavior in Dairy Cattle
Author: Alejandro Villa-GodoyPublisher:
ISBN:
Category : Dairy cattle
Languages : en
Pages : 356
Book Description
Follicular Development in Postpartum Dairy Cattle
Author: Stephen Wayne BeamPublisher:
ISBN:
Category : Dairy cattle
Languages : en
Pages : 522
Book Description
Lactation Length Management
Author: Energy Balance, LH Secretion and Interval to First Ovulation in Early Postpartum Dairy Cattle
Author: Richard W. CanfieldShortening Or Omitting the Dry Period in Dairy Cows
Author: Negative Energy Balance in Dairy Cows as Related to Fertility
Author: Ruurd JorritsmaPublisher:
ISBN: 9789039332863
Category :
Languages : en
Pages : 159
Book Description
Energy Balance and Progesterone Levels as Reproductive Management Tools for Contemporary Multiparous Dairy Cattle
Author: Noe Alberto GomezPublisher:
ISBN: 9781369311518
Category :
Languages : en
Pages :
Book Description
The reproductive performance of contemporary high producing dairy cattle has decreased in past decades. By examining the energy balance and progesterone concentrations of high producing dairy cows around the time of artificial insemination (AI), this project aimed to contribute understanding of the interface between their nutritional status and reproductive physiology. Thirty-two multiparous dairy cows between 70 and 180 days in milk (DIM) were enrolled at -10 days relative to artificial insemination (AI) and underwent a common 3-injection synchronization protocol of Factrel®, Lutalyse® and Factrel® at -10, -3 and -1 day from AI. Of the 32 cows, 14 were determined pregnant via rectal palpation on day 39 post AI. Coccygeal blood samples of the 32 cows were collected on days -10 and -3 from AI to determine cyclicity of the cows, as well as at AI and 6, 13 and 20 days post-AI. Milk progesterone was measured at 20 days post-AI, and body condition was scored (BCS, 1-5 scale) on days -10, 0, 13 and 27 days relative to AI. Non-esterified fatty acid (NEFA) levels were measured on the same days of BCS as an index of real-time energy balance, but provided no predictive measurement on day 39 of pregnancy. The change in BCS from day -10 to AI, as an index of near-term energy balance, was similarly unpredictive of pregnancy outcome. However, the average BCS of cows pregnant at day 39 post-AI, as an index of long-term energy balance, was higher (2.71 vs 2.42; P = 0.02) on the day of AI compared to non-pregnant cows. Serum progesterone levels of cows pregnant at day 39 post-AI were higher (P 0.05) on days 6, 13 and 20 post-AI and milk progesterone at 20 days post-AI was also higher (P
Effect of Nutrition and Energy Balance in Early Lactation on Production and Fertility of Dairy Cows
Author: Patrick Joseph PattonPublisher:
ISBN:
Category : Cattle
Languages : en
Pages : 205
Book Description
Author: