scholarly journals Contribution of genetic variability to phenotypic differences in on-farm efficiency metrics of dairy cows based on body weight and milk solids yield

2021 ◽  
Author(s):  
D.P. Berry ◽  
J. McCarthy
Keyword(s):  
Body Weight ◽  
Genetic Variability ◽  
Dairy Cows ◽  
Phenotypic Differences ◽  
Farm Efficiency ◽  
Milk Solids ◽  
On Farm

scholarly journals A three-year investigation of the performance of spring-calving dairy cows grazing ryegrass-based pastures of high or low endophyte toxin status in Northland

2001 ◽  
pp. 209-214
Author(s):  
R.G. Keogh ◽  
M.B. Blackwell
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Pasture Quality ◽  
Holstein Friesian ◽  
Ancillary Information ◽  
Milk Solids ◽  
On Farm ◽  
Measurement Period ◽  
Friesian Cows

On-farm milk production and ancillary information was monitored for spring-calving cows grazing high (HT) and low toxin (LT) pastures in Northland over three seasons from spring 1997 to autumn 2000. Two groups of 16 second-calving Holstein-Friesian cows, balanced for calving date and production worth, grazed HT or LT ryegrass pastures from October 1997 to May 1998. Milk production was monitored for 10 consecutive days each month culminating with a herd test. The LT group out-produced the HT group for each measurement period from December, and over the whole season, produced 20% more milk solids. The HT group had significantly higher serum lysergol levels and correspondingly lower prolactin levels than the LT group. As pasture quality was similar it was suggested that the differences in milk production were most likely due to differences in intake. At the start of the 1998-1999 season 25% of the farm was in low endophyte ryegrass or in ryegrass with the AR1 endophyte. The farm and herd were split so that milk production from HT and LT farmlets could be monitored. Milk from each group was collected into separate tanks and all cows were 'herd-tested' 4-weekly. Despite twothirds of the LT farmlet being conserved for silage, which resulted in a severe feed shortage that necessitated supplements being fed-out on this farmlet from January, the LT group out-produced the HT group by 5% per cow and by 10% per hectare for the season from October to late May. In the 1999-2000 season, the farm and herd split was 29% LT and 71% HT. The objective was changed to one of maximising production from each system and this required changes in management. The LT system was managed to encourage clover-dominance from mid-spring and this was achieved by lengthening the rotation out to 6 weeks and then reducing it back to 3.5 weeks by leaving higher residuals and conserving

The effect of recombinant bovine somatotrophin on milk production, reproduction and health of dairy cows

1987 ◽  
Vol 1987 ◽  
pp. 3-3 ◽  
Author(s):  
C. Thomas ◽  
I.D. Johnsson ◽  
W.J. Fisher ◽  
G.A. Bloomfield ◽  
S.V. Morant
Keyword(s):  
Body Weight ◽  
Dairy Cows ◽  
Mixed Diet ◽  
Body Weight Change ◽  
Flat Rate ◽  
Lactating Dairy Cows ◽  
Ad Libitum ◽  
Voluntary Intake ◽  
Milk Solids ◽  
Bovine Somatotrophin

The objective of the trial was to examine the effect of recombitant bovine somatotrophin (bSTH) on voluntary intake, milk solids output, body weight change, health and reproduction in lactating dairy cows given either a complete mixed diet or fed concentrate at a flat rate and forage ad libitum.

Digestibility of Nutrients as Influenced by Supplementation of Exogenous Fibrolytic Enzymes in Dry Non-pregnant Cows

2019 ◽  
Vol 14 (04) ◽  
Author(s):  
P. M, Lunagariya ◽  
R. S. Gupta ◽  
S. V. Shah ◽  
Y. G. Patel
Keyword(s):  
Body Weight ◽  
Weight Gain ◽  
Dairy Cows ◽  
Dry Matter ◽  
Body Weight Gain ◽  
The Body ◽  
Neutral Detergent Fiber ◽  
Acid Detergent Fiber ◽  
Fibrolytic Enzymes ◽  
Nitrogen Free Extract

The study was planned to evaluate the effect of exogenous fibrolytic enzymes (EFE) supplementation for 56 days @ 240 mg/kg total mixed ration (TMR) on digestibility of dry matter and nutrients in dairy cows. Six dry non-pregnant cows were assigned in each treatment with and without EFE. The digestibility trial of seven days was conducted after 49 days of feeding. Dry matter and nutrients intake of cows was not influenced by EFE. The supplementation of EFE had improved digestibility of dry matter, organic matter, crude fiber, neutral detergent fiber, cellulose (p less than 0.01), as well as digestibility of nitrogen-free extract and acid detergent fiber, was also higher (pless than 0.05). The body weight gain of cows was higher on the supplementation of EFE in TMR. The study concluded that feeding exogenous fibrolytic enzymes (240 mg/kg) supplemented TMR improved digestibility of dry matter and nutrients, which was reflected as higher body weight gain in dry non-pregnant Gir and crossbred dairy cows.

scholarly journals On-farm examination of sainfoin supplementation effects in dairy cows in a roughage-based feeding system: indicators of protein utilisation

2021 ◽  
pp. 104509
Author(s):  
Alexandra N. Kapp-Bitter ◽  
Uta Dickhoefer ◽  
Gerdine Kaptijn ◽  
Vasilisa Pedan ◽  
Erika Perler ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Feeding System ◽  
Protein Utilisation ◽  
On Farm

scholarly journals Recent Possibilities for the Diagnosis of Early Pregnancy and Embryonic Mortality in Dairy Cows

Animals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1666
Author(s):  
Ottó Szenci
Keyword(s):  
Blood Flow ◽  
Dairy Cows ◽  
Early Pregnancy ◽  
Fetal Mortality ◽  
Reproductive Efficiency ◽  
Interferon Tau ◽  
Early Pregnancy Factor ◽  
Pelvic Inlet ◽  
On Farm ◽  
Protein Assays

One of the most recent techniques for the on-farm diagnosis of early pregnancy (EP) in cattle is B-mode ultrasonography. Under field conditions, acceptable results may be achieved with ultrasonography from Days 25 to 30 post-AI. The reliability of the test greatly depends on the frequency of the transducer used, the skill of the examiner, the criterion used for a positive pregnancy diagnosis (PD), and the position of the uterus in the pelvic inlet. Non-pregnant animals can be selected accurately by evaluating blood flow in the corpus luteum around Day 20 after AI, meaning we can substantially improve the reproductive efficiency of our herd. Pregnancy protein assays (PSPB, PAG-1, and PSP60 RIA, commercial ELISA or rapid visual ELISA tests) may provide an alternative method to ultrasonography for determining early pregnancy or late embryonic/early fetal mortality (LEM/EFM) in dairy cows. Although the early pregnancy factor is the earliest specific indicator of fertilization, at present, its detection is entirely dependent on the use of the rosette inhibition test; therefore, its use in the field needs further developments. Recently found biomarkers like interferon-tau stimulated genes or microRNAs may help us diagnose early pregnancy in dairy cows; however, these tests need further developments before their general use in the farms becomes possible.

scholarly journals The Carbon Footprint of Energy Consumption in Pastoral and Barn Dairy Farming Systems: A Case Study from Canterbury, New Zealand

2019 ◽  
Vol 11 (17) ◽  
pp. 4809 ◽  
Author(s):  
Hafiz Muhammad Abrar Ilyas ◽  
Majeed Safa ◽  
Alison Bailey ◽  
Sara Rauf ◽  
Marvin Pangborn
Keyword(s):  
New Zealand ◽  
Carbon Footprint ◽  
Dairy Farming ◽  
Carbon Footprints ◽  
Energy Inputs ◽  
Study Results ◽  
Feed Supplements ◽  
Dairy Systems ◽  
Milk Solids ◽  
On Farm

Dairy farming is constantly evolving to more intensive systems of management, which involve more consumption of energy inputs. The consumption of these energy inputs in dairy farming contributes to climate change both with on-farm emissions from the combustion of fossil fuels, and by off-farm emissions due to production of farm inputs (such as fertilizer, feed supplements). The main purpose of this research study was to evaluate energy-related carbon dioxide emissions, the carbon footprint, of pastoral and barn dairy systems located in Canterbury, New Zealand. The carbon footprints were estimated based on direct and indirect energy sources. The study results showed that, on average, the carbon footprints of pastoral and barn dairy systems were 2857 kgCO2 ha−1 and 3379 kgCO2 ha−1, respectively. For the production of one tonne of milk solids, the carbon footprint was 1920 kgCO2 tMS−1 and 2129 kgCO2 tMS−1, respectively. The carbon emission difference between the two systems indicates that the barn system has 18% and 11% higher carbon footprint than the pastoral system, both per hectare of farm area and per tonne of milk solids, respectively. The greater carbon footprint of the barn system was due to more use of imported feed supplements, machinery usage and fossil fuel (diesel and petrol) consumption for on-farm activities.

Effects of body weight loss on serum progesterone concentrations of non-lactating dairy cows

2011 ◽  
Vol 75 (1) ◽  
pp. 131-137 ◽  
Author(s):  
R.O. Rodrigues ◽  
C. Trevisanuto ◽  
R.F. Cooke ◽  
J.L.M. Vasconcelos
Keyword(s):  
Weight Loss ◽  
Body Weight ◽  
Dairy Cows ◽  
Body Weight Loss ◽  
Serum Progesterone ◽  
Lactating Dairy Cows

scholarly journals Genetic Relationships among Body Condition Score, Body Weight, Milk Yield, and Fertility in Dairy Cows

2003 ◽  
Vol 86 (6) ◽  
pp. 2193-2204 ◽  
Author(s):  
D.P. Berry ◽  
F. Buckley ◽  
P. Dillon ◽  
R.D. Evans ◽  
M. Rath ◽  
...  
Keyword(s):  
Body Weight ◽  
Dairy Cows ◽  
Milk Yield ◽  
Body Condition ◽  
Body Condition Score ◽  
Genetic Relationships ◽  
Condition Score
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