A prepartum diet supplemented with oilseeds high in oleic or linoleic acid reduced GnRH-induced LH release in dairy cows during second week postpartum

A prepartum diet supplemented with oilseeds high in oleic or linoleic acid reduced GnRH-induced LH release in dairy cows during second week postpartum

BACKGROUND The objective was to determine the effect of prepartum diets supplemented with rolled canola seed (high in oleic acid) or sunflower seed (high in linoleic acid) on luteinizing hormone (LH) pulsatility and gonadotropin releasing hormone (GnRH)-induced LH release during early postpartum. METHODS Thirty-one pregnant Holstein cows, blocked by body condition score, parity and expected c...

Effect of days postpartum and endogenous reproductive hormones on GNRH-induced LH release in dairy cows.

Forty-eight Holstein and Guernsey cows were assigned according to age and breed to one of seven groups based on days following parturition. Cows in Groups II to VII received an intramuscular injection of 100 ~tg gonadotropin releasing hormone (GnRH) on either 1 or 2, 3 or 4, 5 or 6, 7 or 8, 12 or 13, or 18 or 19 days postpartum, respectively (six cows per group). An injection of the carrier veh...

Effect of Conjugated Linoleic Acid Supplement and Sesame as Source of N-6 on Performance and Milk Fatty Acid Profile of Holstein Dairy Cows During Transition Period

Background: Feeding unsaturated fatty acids sources in dairy cows is considered as a strategy to improve animal health during postpartum period and milk fatty acid profile. OBJECTIVES: This study aimed to investigate the effects of conjugated linoleic acid supplement and combination of sesame meal and oil on performance and milk fatty acid composition of dairy cows during transition period. MET...

Management of Postpartum Reproductive Performance with Administration of GNRH or PGF2α in Cross Bred Dairy Cows

The present study was conducted to investigate the influence of administration ofGnRH orPGF2α during early postpartum (PP) on uterine involution (UI), postpartum period (PPP), days open (DP) number of services per conception and calving interval (CI) in cross-bred dairy cows. A total of 45 cross-bred dairy cows (4 – 8 years) were recruited to determine the influence of administration of GnRH or...

Relationship between intake and duodenal flows of linoleic acid in dairy cows fed lipid-supplemented diets.