Genetic merit for milk production and reproductive success in dairy cows

Snijders, S.; Dillon, P.; O’Farrell, K.J.; Diskin, M.G.; Wylie, A.R.G.; O'Callaghan, D.; Rath, M.; Boland, M.P.

doi:10.1016/s0378-4320(00)00217-7

Cited by 74 publications

(54 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…If these effects of NEFA on progesterone are present, they may lead to lower pregnancy ratios [89]. There was no effect of NEFA detectable on the conception ratio after first service in high genetic merit cows and on the interval from parturition to first ovulation [73,84].…”

Section: A Role For Non-esterified Fatty Acidsmentioning

confidence: 99%

Metabolic changes in early lactation and impaired reproductive performance in dairy cows

Jorritsma

Wensing

Kruip³

et al. 2003

Vet. Res.

203

163

View full text Add to dashboard Cite

-This review addresses the suggestion that the decline in dairy reproductive performance, as increasingly observed these days, may be due to a hampered process of metabolic adaptation in early lactating cows. In our opinion, adaptation to the negative energy balance is a gradual process. Because almost all cows do adapt in the long run, it is not possible to classify animals as adapted or non-adapted. The use of risk factors is more appropriate in this case and is discussed in this review. Among them are the body condition score and its derivatives, feed intake, the calculated negative energy balance, and metabolic parameters like the plasma concentration of insulin or the triacylglycerol content in the liver. Moreover, factors that play a role in the link between declined reproductive performance and the metabolic situation of the cow during the early lactating period are discussed. Among these are insulin, insulin-like growth factors, leptin, neuropeptide Y, nonesterified fatty acids, thyroïd hormones, urea, and ammonia. fertility / dairy / periparturient metabolic adaptation / physiopathology / periparturition

show abstract

Section: A Role For Non-esterified Fatty Acidsmentioning

confidence: 99%

Metabolic changes in early lactation and impaired reproductive performance in dairy cows

Jorritsma

Wensing

Kruip³

et al. 2003

Vet. Res.

203

163

View full text Add to dashboard Cite

show abstract

“…It has also been suggested that the blood glucose concentration affects the rate of synthesis of milk lactose, hence milk volume by osmotic association (Kronfeld 1982). A negative correlation has been demonstrated between milk production and plasma glucose concentration (Jenny et al 1974) and genetically superior cows which have high milk yields maintain a relatively low plasma glucose level (Snijders et al 2001). The general consensus at present is that lactose acts primarily as an osmolyte in milk, so that the effect of increasing lactose synthesis is to draw more water into the milk.…”

Section: Introductionmentioning

confidence: 99%

Associations among milk production traits and glycosylated haemoglobin in dairy cattle; importance of lactose synthesis potential

et al. 2009

View full text Add to dashboard Cite

Glucose is the major precursor of lactose synthesis in the mammary gland. Lactose the major carbohydrate and osmolyte of milk, controls milk volume and its concentration. Glycosylated haemoglobin (HbG) is a retrospective measure of mean blood glucose level and it is largely unaffected by recent physiological conditions and environmental events. The purposes of this study were to determine the correlations between lactose traits and other milk production traits in dairy cattle and to investigate whether HbG level can be correlated with milk and lactose production traits. Here, HbG percentage, milk and lactose production traits including milk yield, lactose, protein, SNF, total solid and fat percentages and yields were measured in 485 second calved Iranian Holstein cattle. Statistically significant negative correlations were established between HbG and milk yield (r=−0.88), lactose yield (r=−0.83), SNF yield (r=−0.81), protein yield (r=−0.79) and total solid yield (r=−0.74). Positive correlations were established between lactose yield and milk (r=0.96), protein (r=0.81), SNF (r=0.92) and total solid (r=0.79) yields. The negative correlation between HbG and milk and total lactose production is Vet Res Commun (2010) probably related to the higher glucose demands in the lactating mammary gland of more productive cows. The positive correlation between lactose yield and milk, protein, SNF and total solid yield indicates that the level of lactose synthesis influences milk production traits in ways other than merely via its osmolytic action.

show abstract

“…The present study examines the relationship between production and reproductive performance in the Czech Holstein population and points to a possible direction in selecting concerning these two economically important trait groups. High genetic merit cows have higher milk production, which is followed by greater BCS losses between calving and first service (Snijders et al, 2001). BCS at the time of calving as well as BCS nadir and amount of BCS losses post-calving are associated with milk production, reproduction and health (Roche et al, 2009).…”

mentioning

confidence: 99%

Genetic parameters for female fertility and milk production traits in first-parity Czech Holstein cows

Zink¹,

Lassen²,

Štípková³

2012

Czech J. Anim. Sci.

View full text Add to dashboard Cite

ABSTRACT:The aim of this study was to estimate genetic parameters for female fertility and production traits in first-parity Czech Holstein cows and to quantify the effect of using this information on the accuracy of a selection index in seven different scenarios. In order to estimate genetic (co)variance components, the DMU software running an AI-REML algorithm was used. The analyses were made using a series of bivariate animal models. The pedigree included 164 125 animals and it was set up using a pruned animal model design. The present study included the following female fertility traits for the first lactations: calving to the first insemination (CF), days open (DO), calving from the first to the last insemination (FL), and milk production traits: milk production (MLK), kg of fat (FAT), and kg of protein (PROT). The heritability for all the investigated fertility traits was low and close to 0. Moderate heritabilities for production traits ranging from 0.20 (MLK) to 0.23 (PROT) were estimated. The strongest unfavourable correlation was found between PROT and DO (0.49). Other estimated correlations between fertility traits and production traits were moderate, ranging from 0.26 to 0.41. The results of this study evidence that cows with the poorest genetic potential for reproductive performance are those having high genetic potential for milk production and milk components. The results also show that the number of days from calving to new pregnancy depends on the production level. Seven investigated scenarios using selection index theory show a clear trend for increasing accuracy when more fertility traits were added as well as when higher numbers of daughters with information on reproduction traits per sire were available.

show abstract

Genetic merit for milk production and reproductive success in dairy cows

Cited by 74 publications

References 30 publications

Metabolic changes in early lactation and impaired reproductive performance in dairy cows

Metabolic changes in early lactation and impaired reproductive performance in dairy cows

Associations among milk production traits and glycosylated haemoglobin in dairy cattle; importance of lactose synthesis potential

Genetic parameters for female fertility and milk production traits in first-parity Czech Holstein cows

Contact Info

Product

Resources

About