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Showing 1 to 20 of 170 for “"milk yield"”.
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Milk Yield as a Factor in Dairy Herd Management by Exception
Made available in DSpace on 2014-12-14T06:37:07Z (GMT). No. of bitstreams: 1 7606807.pdf: 5064144 bytes, checksum: fe4c03765b7c34ddad69455241a2fe57 (MD5) Previous issue date: 1975
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Local regulation of increased milk yield due to early lactation increased milking frequency
Increased milking frequency (IMF) during early lactation increases milk yield not only during the IMF period, but also after the cow is returned to twice daily milking (2X). The increase in yield is locally regulated within the gland; however the mechanism for the increase in yield is unknown. The …
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The Physiology of Enhanced Milk Yield Through Increased Milking Frequency in Early Lactation
Increased milking frequency (IMF) in early lactation is a time and cost-effective farm management practice to enhance profit in the dairy industry. The process involves milking cows more often in early lactation alone. On farms that milk twice daily (2X), early lactation cows are milked four times …
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Effects of selection for milk yield on dairy cattle performance and endocrine regulation
… on body weight (BW), dry matter intake (DMI), milk yield, fat percent, and on plasma concentration of insulin (INS), growth hormone (GH), and Insulin-like Growth Factor I (IGF-I) were studied in two groups of first lactation Holstein cows of differing genetic merit (selection vs control). Dry …
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Some Effects of Inbreeding With Selection on Milk Yield and Growth in Milk Goats
Made available in DSpace on 2014-12-05T23:07:54Z (GMT). No. of bitstreams: 1 5900552.pdf: 3406105 bytes, checksum: 0d70b09c278f8f571afe1b05869712ff (MD5) Previous issue date: 1958
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The Influence of Heat Stress on Milk Yield, Gastrointestinal Permeability, and Nutrient Partitioning in Lactating Dairy Cattle
… lactating dairy cattle produce less milk because they consume less feed. It has since been established that the reduction of feed intake is only responsible for about 50% of the reduced milk yield in HS cows. It is believed that HS increases gastrointestinal permeability (GIP), …
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Genotype by environment interaction for Holstein milk yield and fitness traits between Saudi Arabia and the United States
… first and all lactations mature equivalent milk and reproductive traits in the first four lactations were estimated by multiple-trait animal model using Method R procedures. The objectives of this study were to determine if genotype by environment interactions for milk yield and fitness …
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Predictive equations for milk yield and dry matter intake and development of a maximum-profit ration formulation model
… experiments in which total feed intake and milk production was recorded. A total of 492 cows on these experiments provided 4135 Holstein and 704 Jersey 28-day records which contained information on feed intake, milk yield, butterfat content, ration composition, body weight, season and stage …
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Relationships between first lactation milk yield, first calving interval, herd life, lifetime milk production, and descriptive type subtraits in Holstein cattle
… first calving interval, herd life, and lifetime milk and fat yields. Variables other than type traits were expressed as deviations from the contemporary average. Heritabilities of type subtraits ranged from .00 to .45. First lactation milk and fat yields were approximately 30% heritable, whereas …
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The effect of selection for milk yield on net energy balance and plasma concentrations of endogenous hormones and metabolites in primiparous Holsteins
The effect of genetic selection for milk yield on lactation yield, net energy balance (NEB) and on plasma growth hormone (GH), insulin (INS), prolactin (PRL), nonesterified fatty acids (NEFA) and glucose was studied in primiparous Holstein cows. Net energy balance was calculated and serial blood …
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Evaluation of the Moringa oleifera leaf meal effects on milk yield, milk quality and the helminthic load of saanen dairy goats in rangeland conditions at Neudamm farm
… popular small ruminants kept mainly for meat and milk. Over time, goat milk became popular and a substitute for cow milk. Researchers have focused their studies on alternative and cheaper methods of increasing milk yield, milk quality and improved animal health. This study aimed to assess the …
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Effects of goat phenotype score on milk characteristics and blood parameters of indigenous and improved dairy goats in South Africa
… system (PTS), a new concept, in evaluating milk yield and constituents in different goat genotypes (Indigenous, British Alpines, Saanen and Toggenburg) raised in small scale production systems. Strategic decisions of small scale African farmers are mostly based on visual appraisal or body …
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Relationships between somatic cell counts and milk production in dairy cattle
Monthly milk production data collected by DHI supervisors in 28 Virginia dairy herds over a three year period were analyzed. Relationships between somatic cell count and milk production were determined. A curvilinear relationship between somatic cell count and daily milk yield was shown to exist. …
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Interactions of Sires With Feeding and Management Factors in Illinois Holstein Cows
… estimate components of phenotypic variation in milk yield due to the interactions between sires and several feeding and management factors and to examine the implications of the estimated interactions in sire evaluation for milk yield. Data on feeding and management practices in Illinois …
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Changes in Body Condition from Prepartum to Postpartum on Health and Reproduction in Dairy Cattle
… differential, haptoglobin (Hp) concentrations, milk yield and monitoring health status. The body condition score changed significantly with time with the greatest unit loss being in the over-conditioned cattle from d -30 to d 35 postpartum. The BCS losses for each category did not have a …
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Phenotypic Relationships between Lactation persistency and Common Health Disorders in Dairy Cows
… maintain production at a higher level after peak yield. Hypothetically, more persistent cows are less susceptible to health and reproductive disorders. The objective of this research was to investigate the phenotypic relationships of common health disorders in dairy cows to lactation persistency. …
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Effects of pasture silage on yield and composition of milk from dairy cows
Factors affecting milk yield and composition were reviewed and it was concluded that feeding level and diet type (notably unwilted pasture silage) may have independent effects on yield and composition of milk. The objective of this research was to investigate the separate effects of forage type and …
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Performance of Pre and Post-Partum Weather Stressed Cows Supplemented with Yeast Culture
… have reported that yeast products increased milk yield and milk fat percentage; however, other studies found that yeast products had no effect on any of these factors (Middelveld. H 1998). A three phase trial, starting August 2003 and ending February 2005, was conducted at the Western …
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Whole-plant corn silage and foliar fungicide: Strategies to improve dairy feed quality and profitability
… been on the decline for some time now; however, milk production continues to climb. This increase in efficiency can be attributed to genetic advancements, improvements in management, and the utilization of nutritional strategies. The most important of these is to feed high-quality ingredients in …
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Changes in Activity and Milk Components Around the Onset of Peripartum Diseases in Dairy Cows
Activity and milk components were examined around disease onset in the periparturient period. Cows were monitored for daily rest bouts, rest duration, rest time, and step activity from -21 to +30 d relative to calving. Lactose concentration, fat to protein ratio (F:P), and milk yield were …
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