Effects of age and liveweight of dairy heifers at first calving on multiple lactation production

2004 ◽  
Vol 44 (10) ◽  
pp. 969 ◽  
Author(s):  
R. C. Dobos ◽  
K. S. Nandra ◽  
K. Riley ◽  
W. J. Fulkerson ◽  
A. Alford ◽  
...  

This paper reports on both the individual and combined effects of age and liveweight at first calving (AFC and LWFC, respectively) for Australian Holstein–Friesian heifers on multiple lactation production. One hundred and thirty-five heifers were allocated to 1 of 3 AFC treatments. Within each AFC treatment, heifers were randomly assigned to 1 of 3 LWFC treatments. From 16 weeks of age until first calving, heifers in all groups grazed pasture and were provided with supplementary feed when the quantity and quality of pasture was inadequate to meet growth requirements. Mean AFC and LWFC achieved were 25.1 ± 0.121, 29.9 ± 0.11 and 33.9 ± 0.09 months and 498 ± 4.09, 549 ± 5.40 and 595 ± 5.09 kg, respectively. As AFC increased, total production over the first 3 lactations increased. For each month's delay in AFC an extra 56.7 L milk, 1.78 kg milk fat, 1.45 kg milk protein and 3.23 kg fat + protein over the first 3 lactations was produced but by the third lactation the response was minimal. By end of third lactation the remaining heifers that calved at 25.1 months AFC were producing similar amounts to those that calved at the older AFC. As LWFC increased from 498 to 595 kg, production over the first 3 lactations increased. The response to an extra kilogram increase in LWFC was 4.82 L milk, 0.20 kg milk fat, 0.18 kg milk protein and 0.38 kg fat + protein over the first 3 lactations. The greatest benefit was when LWFC increased from 498 to 549 kg. Increasing LWFC from 549 to 595 kg did not significantly increase milk, milk fat and milk protein yields from the second to third lactation. The combined effects of AFC and LWFC indicated that to reduce the negative effects on production due to decreasing AFC, LWFC would have to increase by 7.2, 2.9 and 2.2 kg for each month decrease in AFC (for milk, fat and protein production, respectively). By the end of the third lactation, only 58 heifers remained in the herd. The number of heifers remaining within the 9 groups ranged from 4 to 10. Increasing LWFC while decreasing AFC reduced the chances of a heifer remaining in the herd but this may have been biased by the feeding regime imposed during lactation. Responses to increasing AFC decreased as the number of lactations increased, indicating that heifers calving at younger AFC produce similar amounts to their older herd-mates by the end of third lactation. Increasing LWFC from 498 to 549 kg had the greatest benefits for yield, indicating a possible maximum LWFC of 549 kg for our study. Therefore, the negative effects due to decreasing AFC can be offset in part, by increasing LWFC. However, on-farm resources and ultimately milk price will determine the choice of combination of AFC and LWFC.

2001 ◽  
Vol 41 (1) ◽  
pp. 13 ◽  
Author(s):  
R. C. Dobos ◽  
K. S. Nandra ◽  
K. Riley ◽  
W. J. Fulkerson ◽  
I. J. Lean ◽  
...  

This paper reports on both the individual and combined effects of age (AFC) and liveweight (LWFC) at first calving for Australian Holstein–Friesian heifers on first lactation production. One hundred and thirty-five Australian Holstein–Friesian heifers were allocated to 1 of 3 AFC treatments. Within each AFC treatment, heifers were randomly assigned to 1 of 3 LWFC treatments. Heifers in all groups grazed pasture and were supplemented when the quantity and quality of pasture was inadequate to meet growth requirements. Mean AFC and LWFC achieved were 25.1, 29.9 and 33.9 months and 498, 549 and 595 kg, respectively. Mean liveweight gains from 16 weeks of age to calving ranged from 0.45 to 0.71 kg/day, depending on treatment. The heifers calving at 33.9 months of age produced 6.6 and 12.3% more milk, 6.3 and 11.9% more protein and 5.4 and 12.2% more fat than those calving at 29.9 and 25.1 months of age at the end of their first 300 day lactation, respectively. The lower production of the younger cows was associated with decreased daily output rather than by shorter lactation length. Heifers averaging 595 kg at first calving produced 5.5% more milk, 8.4% more protein and 11.4% more fat than those averaging 498 kg in first lactation, respectively. The heifers averaging 621 kg LWFC and 34 months AFC had the highest production of the 9 treatment groups. Production was increased by 5.35 L milk, 0.19 kg protein and 0.23 kg fat for an additional 1 kg LWFC, respectively. For each month delay in AFC, production was increased by 66.7 L milk, 1.87 kg protein and 2.36 kg fat, respectively. The combined effects of AFC and LWFC showed that to offset the negative effects of a 1 month reduction in AFC on milk, protein and fat yields in first lactation, LWFC would have to be increased by 8.1, 4.0 and 4.5 kg, respectively. Under the conditions of this experiment, maximum milk, protein and fat were estimated to be achieved at 559, 563 and 568 kg liveweight at first calving, respectively.


2005 ◽  
Vol 45 (4) ◽  
pp. 331 ◽  
Author(s):  
W. J. Fulkerson ◽  
K. McKean ◽  
K. S. Nandra ◽  
I. M. Barchia

Two experiments were conducted, each over several months, when cows grazed either ryegrass (September–November 2001) or kikuyu (February–March 2002) pastures, to assess the effects of accurately allocating feed on a daily basis to lactating Holstein–Friesian dairy cows. In each case, 28 cows were randomly stratified into 2 equal groups on the basis of milk and milk component yield, liveweight, age and days in lactation. The metabolisable energy requirements of the animals were estimated from standard established requirements. In each experiment, both groups of cows received the same amount of supplement over a period that was equivalent to a pasture regrowth cycle of 12–16 days. The control group received a set amount of supplements each day, while supplements fed to the adjusted group varied, dependent on pasture available. Available pasture was varied from 7 to 21 kg DM/cow.day (above a stubble height of 5 cm), to mimic the variation found on well-managed dairy farms. When pasture available was above the predicted requirement for cows in the adjusted group, pasture availability was restricted to predicted requirements and the extra milk that could be produced from the spared pasture was estimated. However, cows in the control group had the opportunity to eat more pasture if allocated more than required. This could result in more milk being produced, a gain in liveweight, and/or a higher post-grazing pasture residue (and hence potentially improve pasture regrowth). If less pasture than required was allocated to the control group, production could reduce or the cows might graze harder. Thus, in the control group the proportion of forage to supplement remained relatively constant, but intake varied in relation to pasture allocated, while for the adjusted group the total intake was kept relatively constant. In experiment 1 (ryegrass), the milk yield, percentage of milk fat and liveweight change of cows in the control and adjusted groups was not significantly different. However, the cows in the adjusted group produced 0.016 kg/cow.day more milk protein. As the control group ate 0.35 kg DM/cow.day more ryegrass pasture (P = 0.008) it is assumed that accurate daily allocation of feed improved feed efficiency. In experiment 2, the milk yield and percentage of milk protein of cows grazing kikuyu pastures was not significantly different between groups but the percentage of milk fat and covariate-corrected liveweight at the end of the experiment was higher in the control group than in the adjusted group. The pasture spared by cows in the adjusted group was predicted to produce 8.9% more milk when grazing ryegrass pasture and 12.3% when grazing kikuyu pasture. Linear regression analysis of pasture on offer on post-grazing pasture residue was not significant for the cows in the adjusted group but was significant for the control group cows when grazing either pasture, indicating success in accurately allocating supplementary feed to maintain a constant grazing pressure. The results of this study should assist dairy farmers in deciding whether the effort required to allocate feed accurately to dairy cows on a daily basis, is worthwhile.


2015 ◽  
Vol 50 (4) ◽  
pp. 306-312 ◽  
Author(s):  
Félix Gonzalez ◽  
Rodrigo Muiño ◽  
Víctor Pereira ◽  
Diego Martinez ◽  
Cristina Castillo ◽  
...  

The objective of this work was to determine productive and fertility responses of Holstein-Friesian heifers and cows to supplementation with extruded linseed and soybean as sources of polyunsaturated fatty acids (PUFAs). Supplementation had a positive effect on profitability, with significant increases in milk yield in supplemented cows, but not in heifers. Treatments had no effect on milk fat content, but higher milk protein contents were observed with supplementation. A higher conception rate was found for supplemented heifers, but not for cows. Fat sources containing PUFAs are recommended for dairy cattle supplementation, since they improve fertility in heifers and milk yield in cows.


Author(s):  
S. I. Fyl ◽  
E. I. Fedorovych ◽  
P. V. Bodnar

The results of researches of signs of milk productivity of the cows from different bulls for the first, second, third and higher lactations are presented. Studies were conducted on Black-and-White cattle (n = 1981) at Private Joint Stock Company “Plemzavod Styepnoy” Zaporizhia Oblast. There was studied the duration of lactation, milk yields of full and 305 days of lactation, fat and protein content in milk, quantity of milk fat and milk protein of descendants of different parents on the basis of a retrospective analysis of data for the period from 2004 to 2017 (the management program of the dairy herd “Uniform-Agri”). It was established that bulls have a significant impact on the formation of milk productivity of cows. Daughters of E. Naitinhel 683403608 had the longest duration of the first, second and higher lactation and descendants of N. Ardent 137922325 of the third one. Daughters of the bull G. Dzhungl 7816598 were the best by the milk yield of the full first and higher lactation, daughters E. Naitinhel 683403608 for the full second, and daughters of N. Ardent 137922325 – for the third. For 305 days of lactating there was observed a significant level of intergroup differentiation for the number of milk yield, milk fat and milk protein and much less by the amount of fat and protein in milk. For the first 305 days of lactation daughters of bull L.H.F. Bay 66821678 (10188.0 ± 377.12 kg) were characterized by the highest milk yield, and daughters of F. Gailuron 103356429 (correspondingly 11028.8 ± 30619; 11643.3 ± 590.20 and 10311.7 ± 382.07 kg) for the second, third and the highest lactation, with both bulls belonging to the line R.O.R.E. Eleveyshn 1491007. For 305 days of the first lactation descendants of the bulls V. Silas 7419933 (7003.5 ± 317.79 kg) from the line H.H. Starbak 352790 had the lowest milk yield, daughters of E. Naitinhel 683403608 (7633.0 ± 182.18; 7605.8 ± 224.58 and 8491.7 ± 185.42 kg respectively) from the line R.O.R.E. Eleveyshn 1491007 by the second, third and highest lactation. Detected by comparison of group average conditionality of phenotypic variability quantitative characteristics of the milk productivity of cows derived from different parents was confirmed by the dispersion analysis conducted by us. The most significant influence of bulls were made on the milk yields of daughters for the first-third lactation (12.9–16.8%), lower – for the amount of milk fat (12.4–15.6%) and milk protein (12.2–15.8%) and even lower – for the content of fat (2.5–4.2%) and protein in milk (3.7–6.6%). It should be noted that the effect of the bulls on signs of milk productivity for the lactation under study in their daughters in almost all cases was reliable (P & lt; 0.05–0.001) except for the fat content in milk for the first lactation and fat and protein – for the second and third lactation.


2007 ◽  
Vol 50 (3) ◽  
pp. 273-278
Author(s):  
N. Poljičak-Milas ◽  
T. S. Marenjak

Abstract. The experiment was conducted on three farms of dairy goats. The experimental groups of animals were during the four months period supplemented with 5g Mepron®, (Degussa, Germany), daily. Milk yield, milk protein and milk fat content were recorded throughout the experiment. The milk production was statistically higher in the experimental group of animals on two farms, farm 1 and farm 3 in the first control period, a month after the application, whereas on farm 2, the higher milk production was present in the third and forth control period, two and three months after the application. During the experiment there was no statistically differences in milk protein and milk fat content between experimental and control groups on farm 1 and farm 2, whereas on farm 3 the milk fat content was statistically lower during the Mepron® supplementation. In conclusion, the higher milk production in the first control period on farm 1 and 3 with great probability referred to the influence of Mepron®. The higher milk production on farm 2 in the third and fourth control period coincided with introduction of alfalfa hay in daily ration, that may have enriched the amino acid supply.


Author(s):  
Samira. A. majdoubeh, Mustafa. F. El-Burki Samira. A. majdoubeh, Mustafa. F. El-Burki

The study aimed at show the impact of poverty and unemployment in the threat of members of society, by discussing the concept of unemployment, and following the verses of the Qur'an and Sunah in addressing the unemployment crisis as one of the most important threats to society and showing ways to remedy it, and that the problem of unemployment is one of the global economic problems facing societies and has repercussions on life and all its aspects, and based on the spread of the unemployment crisis in our time, the researcher addressed the topic of "unemployment crisis and ways to remedy it from an Islamic perspective" , where the first topic was about" The definition of unemployment in the language and terminology", the second topic: " unemployment causes and types in Islam", the third topic: " Islam's view of unemployment and the importance of work", and the fourth topic: Islam's attitude on unemployment and ways to handle it. The last topic, the researcher explained the results and the effects of the unemployment crisis on the individual and society, and she depended on inductive and inferential method in showing and solving this problem through adherence to the divine approach in its treatment, and find ways to reduce its prevalence. The researcher came up with the most important recommendations. The research recommended the need for the state to adopt the idea of small enterprises and handicrafts that contribute solve unemployment and maintain social security among the segments of society, asking sharia to master the work regardless of its nature because of the serious negative effects of unemployment on the Muslim community Some of the most important results of the research are as follows - The spread of unemployment and poverty among segments of society increases crime and delinquency among members of society. - Spreading awareness of the importance of zakat as it is an essential pillar of Islam, and taking care of its performance to fight unemployment. - Spreading awareness of the importance of work regardless of its nature, because unemployment has serious negative effects on the Muslim community.


2019 ◽  
Vol 57 ◽  
pp. 136-142 ◽  
Author(s):  
S. I. Fyl ◽  
E. I. Fedorovych ◽  
P. V. Bodnar

The classic method of improving breeds in cattle breeding is in-line animal breeding. This method allows to preserve the hereditary features of the ancestor and enrich the line by accumulation over several generations of valuable heredity and use the most to perfect the breed outstanding the qualities of individual animals and turn individual peculiarities of the ancestors of the lines into the group. The main property of the line is characteristic of its representatives of consolidation of individual economic utility signs due to kinship and directed breeding and selection that makes the line somewhat different from others. In view of the above, the purpose of our research was to study the milk productivity of black-and-white of different line. The research was conducted on Black-and-White cattle of Public Company "Plemzavod Styepnoy" of the Zaporizhzhya region (n = 1928). In cows of different lines, on the basis of retrospective analysis of data for the period from 2004 to 2017 (program dairy herd management "Uniform-Agri") studied dairy performance for the first, second, third and higher lactation. It was found that cows of the studied lines (Bell 1667366, Valiant 1650414, Eleweishn 1491007, Starbak 352790 and Chif 1427381) differed with each other by the duration of lactation and milk productivity indicators. Eleweishn line animals had the longest duration of the first, second, third and best lactation was noted. By this indicator, they dominated the breeds of others lines respectively at 3.2–34.8; 6.7–27.4; 5.0–38.3 and 28.6–47.8 days. Simultaneously, the highest yields for the first (8705.7 kg), the second (9722.7 kg) and the higher (9740.4 kg) lactations were characterized by the cows of the Chif line, and the lowest ones had the Eleweishn line (respectively 8146.8; 8815.5 and 9251.4 kg). Starbak line (9893.0 kg) appeared to be the best by the third lactation yields, after Chif line (29.9 kg). Bell line had the lowest level (9044.9 kg) of yields by mentioned lactations. It should be noted that the highest growth rate is 305 days from the first to the second lactation was observed in the cows of the Chiff line (by 1017.0 kg), somewhat less – at animals of the Starbak line (853.0 kg), even less – in the individuals of Valyat and Eleweishn (819.5 and 668.7 kg respectively), and the least – in Bell line cows (on 282.0 kg). The level of the yield curve between the second and third lactations was significant lower (exception Starbak line) and animals of the above lines was respectively 140.4; 851.0; 230.1; 311.3 and 156.2 kg. It was found that the smallest variability was worth the first lactation and, depending on the line of cows; the coefficients of variability were within19.4–22.8%. For the second lactation, this indicator ranged from 23.3 to 26.8, for the third – from 23.9 to 28.7 and for the best – from 21.3 to 24.7%. Pretty high the variability in the cow's yields of all studied lines indicates the need for their consolidation on this indicator. One of the important features that characterizes the quality of milk is the content of fat. This indicator in the control cows fluctuated, depending on the line and lactation, from 3.74 to 3.82%. The highest fat in milk is for the first lactation was observed in the animals of the lines Eleweishn (3.77%) and Starbak (3.77%),for the second – Starbak line (3.82%), for the third – the lines of Bell (3.79%) and for higher – the cows of Starbak lines (3.77%) and Bell (3.77%). The lowest indicators of the named feature was observed at the beginning of the Bella line (3.75%), for the second and the third lactation – in the cows of the Valiant line (3.76%), and for the best – in the animals of the Chif line (3.74%). The content of protein in the milk of animals of the studied groups is significantly between they did not differ and it, depending on the lactation and line of animals, was within the limits of 3.17–3.21%, which corresponded to the standard of Ukrainian Black-and-White and Holstein breeds. A certain level of intergroup differentiation is also noted in terms of quantity milk fat. For all the lactation under investigation, cows of the Chif line had the highest rates and the lowest ones were the Eleweishn line. Eleweishn line had the lowest amount milk protein for the first, second and best lactation, and by the third Starbak line, and the highest values for the indicated lactation are respectively in the Chif and Starbak lines. Thus, the comparative analysis of the group average on the numerical livestock of cows of different lines showed a significant level of intergroup differentiation by diet, amount of milk fat and milk protein and much less – by the amount of fat and protein in milk. The highest milk yields for first, second and higher lactation showed cows of the Chif line, for the second – the Starbak line, and the smallest – respectively, the Eleweishn and Bell lines. Strength of influence of lines onto the phenotypic variability of the yield, milk fat and milk protein for the first, second, third and best lactation was insignificant, however reliable, on the content of fat and protein in milk – even less and unreliable.


2002 ◽  
Vol 7 (2) ◽  
pp. 1-4, 12 ◽  
Author(s):  
Christopher R. Brigham

Abstract To account for the effects of multiple impairments, evaluating physicians must provide a summary value that combines multiple impairments so the whole person impairment is equal to or less than the sum of all the individual impairment values. A common error is to add values that should be combined and typically results in an inflated rating. The Combined Values Chart in the AMA Guides to the Evaluation of Permanent Impairment, Fifth Edition, includes instructions that guide physicians about combining impairment ratings. For example, impairment values within a region generally are combined and converted to a whole person permanent impairment before combination with the results from other regions (exceptions include certain impairments of the spine and extremities). When they combine three or more values, physicians should select and combine the two lowest values; this value is combined with the third value to yield the total value. Upper extremity impairment ratings are combined based on the principle that a second and each succeeding impairment applies not to the whole unit (eg, whole finger) but only to the part that remains (eg, proximal phalanx). Physicians who combine lower extremity impairments usually use only one evaluation method, but, if more than one method is used, the physician should use the Combined Values Chart.


2000 ◽  
Vol 151 (8) ◽  
pp. 290-297
Author(s):  
Stephan Hatt

The expansion of the traffic network, in particular the construction of highways, has continuously diminished and divided into small sections the habitat of wild-living animals during the last decades. However, these negative effects can be minimised if suitable measures with regard to line-conduction and construction are taken against. One of these possibilities are the sown-down overbridges. It is essential that these constructions are planned and built in order to meet the requirements of their future users – the various wild-living animals. This study investigates the success of one of these sown-down overbridges. It is this the Loterbuck-overbridge on the A 4.2.9 near Henggart in the canton of Zurich, Switzerland. The focus of this investigation was to find out which species of wild-living animals use the bridge and how much it is frequented. Local people and specialists of the region were interviewed and tracks were picked up on site. Taking into consideration five criteria (species of wild-living animals, positioning and number of overbridges nearby, dimensioning and design of the individual overbridges), the interviews and tracks were assessed. The Loterbuck-overbridge is used by all larger wild-living animals of the region. Especially the browsing and rubbing tracks of deer show that the overbridge has been accepted not only as sown-down overbridge but also as habitat.


Relay Journal ◽  
2019 ◽  
pp. 319-322
Author(s):  
Gamze Güven-Yalçın ◽  
Stephanie Lea Howard ◽  
Hatice Karaaslan

In the Reflective Practice column of the third issue of the Relay Journal, Yamamoto (2019) remarked on the importance of creating a platform for advisors to voice their views, feelings, and experiences, and suggested a need for more reflective narratives to be posted from different social, historical, and cultural contexts in order to provide an intimate view inside advising sessions, thereby offering a better understanding of said advising practices. The aim was to create a forum where advisors could learn from each other, and ultimately, everyone could mutually benefit from the experiences shared. To further this innovative research into Advising in Language Learning (ALL), the initial experiment by language advsiors at Kanda has been replicated in a different setting with four learning advisors from Ankara Yıldırım Beyazıt University, Turkey. The design used by the advisors at Kanda, a narrative style adopted while telling the stories, has been expanded to include a visual message board to which 20 learning advisors have contributed with their short reflective captions on their advisor selves. Additionally, the theme used by the advisors at Kanda, “the most memorable advising experience of this academic year” has been altered in our case to avoid repetition and to allow reflection on different aspects of the advising experiences. Thus, our narratives and the visual message board will examine two different themes: (1) How has advising affected you? (2) How do you define yourself as an advisor? Four narratives have elaborated on the first theme of the influence of advising knowledge and practice on the individual advisors, and the visual message board includes 20 images with reflective captions on the second theme of defining advisor identities.


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