Epidemiological study on factors influencing fertility indices in Israeli dairy herds

Francos, George C.; Distl, O.; Kräusslich, Hans‐Georg; Mayer, E.

doi:10.1016/0093-691x(92)90059-z

Cited by 2 publications

(1 citation statement)

References 24 publications

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“…In agreement with the present study, Elrod and Butler (1993) reported detrimental effect of high CPI in cattle indicated by significantly lower first-service conception rates in Holstein heifers. In dairy cattle (Francos et al, 1992), feeding of diets higher in protein with low energy/protein ratio for lactation and maintenance, was a factor contributing to low fertility. Similarly, Jordan and Swanson (1979b) found that services per conception were increased in cows fed diets containing more than 16% crude protein.…”

Section: Discussionmentioning

confidence: 99%

Reproduction-Nutrition Relationship in Dairy Buffaloes. I. Effect of Intake of Protein, Energy and Blood Metabolites Levels

Qureshi

Habib²,

Samad³

et al. 2002

Asian Australas. J. Anim. Sci

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Fifty one Nili-Ravi dairy buffaloes in their last two months of gestation were selected. After parturition, rectal examination of reproductive organs was carried out until the occurrence of the first oestrus (PEI). Milk samples were analyzed for milk progesterone levels (MPL). Ovulation (POI) was confirmed by rectal palpation and MPL. Feed and blood samples were collected fortnightly and analyzed. Body condition score (BCS) was recorded on a scale of 0 to 5. Crude protein (CP) intake varied among different seasons and correlated positively with serum urea levels, POI (p<0.01) and PEI (p<0.05). Excess CPI was lower in the group showing oestrus as compared to those remaining as anoestrus (p<0.05). The dietary ratio of crude protein -metabolizable energy (CP:ME) in the oestrus animals was narrow and constant, while the anoestrus animals had a widely fluctuating one. In normal breeding season (NBS) calvers, mean serum urea level (SUL) was lower than the low breeding season (LBS) calvers. SUL was positively correlated with PEI and POI (p<0.01). Up to six months postpartum, SUL were constantly higher in anoestrus than oestrus buffaloes. Mean metabolizable energy (ME) intake was lower in the NBS calvers than the LBS calvers (p<0.01). BCS and postpartum ovulation interval were correlated with ME intake (p<0.01). Prepartum ME intake was higher in oestrous as compared to anoestrous animals (p<0.05). Higher and lower ME intakes were associated with anoestrus, while a moderate energy intake was associated with a PEI of less than 75 days. Buffaloes with poor BCS belonged to the LBS calving group and most of the NBS calving buffaloes had good BCS. BCS was negatively correlated with PEI (p<0.01) and was higher in oestrous buffaloes than anestrus. It was concluded that excess intake of crude protein, associated with higher serum urea levels and low energy intake, associated with poor body condition, are the key factors for low reproductive efficiency. It may be corrected by adopting a proper feeding strategy.

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Section: Discussionmentioning

confidence: 99%

Reproduction-Nutrition Relationship in Dairy Buffaloes. I. Effect of Intake of Protein, Energy and Blood Metabolites Levels

Qureshi

Habib²,

Samad³

et al. 2002

Asian Australas. J. Anim. Sci

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Phytoestrogens and Their Metabolites in Bulk-Tank Milk: Effects of Farm Management and Season

et al. 2015

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Phytoestrogens have structures similar to endogenous steroids and may induce or inhibit the response of hormone receptors. The objectives of the present study were to compare the effects of long-term vs. short-term grassland management in organic and conventional dairy production systems, compare organic and conventional production systems and assess seasonal variation on phytoestrogen concentrations in bulk-tank milk. The concentrations of phytoestrogens were analyzed in bulk-tank milk sampled three times in two subsequent years from 28 dairy farms: Fourteen organic (ORG) dairy farms with either short-term or long-term grassland management were paired with 14 conventional (CON) farms with respect to grassland management. Grassland management varied in terms of time since establishment. Short-term grassland management (SG) was defined as establishment or reseeding every fourth year or more often, and long-term grassland management (LG) was defined as less frequent establishment or reseeding. The proportion of red clover (Trifolium pretense L.) in the herbage was positively correlated with milk concentrations of the mammalian isoflavone equol. Therefore, organically produced bulk-tank milk contained more equol than conventionally produced milk, and milk from ORG-SG farms had more equol than milk from ORG-LG farms. Milk produced during the indoor-feeding periods had more equol than milk produced during the outdoor feeding period, because pastures contained less red clover than fields intended for silage production. Organically produced milk had also higher concentrations of the mammalian lignan enterolactone, but in contrast to equol, concentrations increased in the outdoor-feeding periods compared to the indoor-feeding periods. There were no indications of fertility problems on ORG-SG farms who had the highest red clover proportions in the herbage. This study shows that production system, grassland management, and season affect milk concentrations of phytoestrogens. However, compared to soy products, milk concentrations of phytoestrogens are low and future studies are required to investigate if the intake of phytoestrogens from dairy products has physiological effects in humans.

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Epidemiological study on factors influencing fertility indices in Israeli dairy herds

Cited by 2 publications

References 24 publications

Reproduction-Nutrition Relationship in Dairy Buffaloes. I. Effect of Intake of Protein, Energy and Blood Metabolites Levels

Reproduction-Nutrition Relationship in Dairy Buffaloes. I. Effect of Intake of Protein, Energy and Blood Metabolites Levels

Phytoestrogens and Their Metabolites in Bulk-Tank Milk: Effects of Farm Management and Season

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