Great Lakes Dairy Sheep Symposium - the Department of Animal ...

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synthesis in the mammary gland (Bauman et al., 2005b). Specifically, the conjugated linoleic acid isomer trans-10, cis-12 CLA has been shown to be a potent regulator of milk fat synthesis and increased production of this fatty acid has been shown to be related to situations in which MFD occurs. Relationships between trans-10, cis-12 CLA and milk fat synthesis have been examined; there is a curvilinear relationship between the reduction in milk fat yield and the abomasal infusion dose of trans-10, cis-12 CLA in dairy cows (de Veth et al., 2004). Trans-10, cis-12 CLA is a very potent inhibitor of milk fat synthesis in dairy cows with a dose of 2.0 g/d (
Germany); we have shown previously that this rumen-protected dietary supplement is effective at reducing milk fat synthesis in dairy cows (Perfield et al., 2004). Compared to the control treatment, CLA supplementation reduced milk fat content from 6.4 to 4.9% (23% reduction) and fat yield from 95 to 80 g/d (16% reduction), and increased milk yield from 1471 to 1611 g/d (10% increase) and protein yield from 68 to 73 g/d (7% increase). Milk protein content and DMI were unaffected by treatment. The reduction in milk fat yield was due to decreases in both de novo fatty acid synthesis and uptake of preformed fatty acids. Milk fat content of trans-10, cis-12 CLA was < 0.01 and 0.12 g/100 g of fatty acids for the control and CLA treatments, respectively. The temporal pattern for milk fat content and yield demonstrated a progressive decline when ewes received the CLA supplement with a significant deviation from control values beginning by days 4 to 5 of treatment, with a reciprocal increase in milk yield and milk protein yield (Figure 3). Figure 3. Temporal pattern of milk fat content (A), milk fat yield (B), milk yield (C), and milk protein yield (D) of ewes unsupplemented (Control; solid squares) or supplemented with conjugated linoleic acid (CLA; open triangles). Values represent means from 20 ewes. Milk Fat, % Milk Fat Yield, g/d 7.0 6.0 5.0 4.0 120 100 80 60 A B 1 2 3 4 5 6 7 8 9 10 Day of Treatment Control CLA The present study represented the first to examine effects of CLA on milk fat synthesis in sheep, and these data demonstrate that a CLA supplement containing trans-10, cis-12 CLA reduced milk fat synthesis in a manner similar to that observed in lactating dairy cows when fed at an equivalent dose (MBW basis). Furthermore, the reduction in milk fat coincided with an increase in milk and milk protein yield. Increases in milk yield and milk protein yield have previously been observed in early lactation (Bernal-Santos et al., 2003) and pasture-fed dairy cows (Mackle et al., 2003). Thus, in situations where nutrient supply may be marginal, CLAinduced milk fat depression may allow a repartitioning of nutrients to support an increase in the synthesis of milk and milk protein. However, nutrient status was adequate in our investigation with lactating ewes. The present study is too limited to allow inferences as to mechanism, but 73 Milk Yield, g/d Milk Protein Yield, g/d 1700 1600 1500 1400 80 75 70 65 60 C D 1 2 3 4 5 6 7 8 9 10 Day of Treatment
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Proceedings of the 11 th Annual GRE
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Table of Contents Program of Events
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Program of Events Thursday, Novembe
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Speakers at the symposium site in B
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Gold: Sponsors Babcock Institute fo
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“YOU WANT TO MILK WHAT?” IMPORT
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already have their milking faciliti
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efficient or just selling milk (or
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production doubles. However, there
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Total production (pounds) Percentag
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Milk production (pounds) Average mi
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Percentage of ewes in each system 1
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5. Ice Cream and Butter: • raw mi
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3. Fresh Cheeses made from pasteuri
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The Vermont Cheese Council (www.vtc
Page 31 and 32: 1 x Brine Tank (10’ long x 3 ft.
Page 33 and 34: LAMB REARING STRATEGIES: FARMER PAN
Page 35 and 36: BONNIEVIEW FARM’S LAMB REARING ST
Page 37 and 38: REARING LAMBS AT 3-CORNER FIELD FAR
Page 39 and 40: PROFITABILITY OF SMALL RUMINANT FAR
Page 41 and 42: Table I. General Farm Description L
Page 43 and 44: Table 4. Business Balance Sheet Ass
Page 45 and 46: Table 5. Income Statement Income Av
Page 47 and 48: Lifestyle is a definite reason for
Page 49 and 50: Grossman et al., 1999). Animals wit
Page 51 and 52: Physiological Factors Affecting Lac
Page 53 and 54: Recently, it has been hypothesized
Page 55 and 56: (co)variate in the genetic model us
Page 57 and 58: show that milk production increases
Page 59 and 60: Figure 6 - Lactation curves of ewes
Page 61 and 62: milk yield (g/d) 3000 2500 2000 150
Page 63 and 64: a genetic potential to produce more
Page 65 and 66: when compared with the control grou
Page 67 and 68: probability (%) 70 60 50 40 30 20 1
Page 69 and 70: considered “healthy” if every S
Page 71 and 72: Finally, udder health has to be con
Page 73 and 74: De Maria Ghionna C., Dell’Aquila.
Page 75 and 76: Manalu, W., Sumaryadi, M.Y., Sudjat
Page 77 and 78: Rupp R., Boichard D., Barbat A., As
Page 79 and 80: Introduction MILK FAT SYNTHESIS AND
Page 81: The variety of fatty acids allows t
Page 85 and 86: Manipulating Milk Fatty Acid Compos
Page 87 and 88: increase in rumen output of vacceni
Page 89 and 90: Luna et al., 2005; Nudda et al., 20
Page 91 and 92: Cabiddu, A., M. Decandia, M. Addis,
Page 93 and 94: MANAGING YOUR OWN RETAIL SHOP: MARK
Page 95 and 96: The Reality our feta demonstrates t
Page 97 and 98: Meat and meat dishes: 1. Legs: whol
Page 99 and 100: 5. We have daily visits from chefs
Page 101 and 102: HOW TO GRAZE DAIRY SHEEP AND SUPPLE
Page 103 and 104: significantly increase milk product
Page 105 and 106: All parameters are significantly di
Page 107 and 108: Table 6 - Dry matter intake and mil
Page 109 and 110: animals can reduce intake, as they
Page 111 and 112: Milk fat and protein concentrations
Page 113 and 114: fat concentration can be used as a
Page 115 and 116: (1998), working with adult Sarda ew
Page 117 and 118: equirements. The relationship found
Page 119 and 120: that there have not been enough stu
Page 121 and 122: Grazing methods Grazing methods are
Page 123 and 124: How should the number of paddocks b
Page 125 and 126: Table 16 - Description of four past
Page 127 and 128: a) concentrates supplied during mil
Page 129 and 130: References Arnold G.W., and Dudzins
Page 131 and 132: supplemented with corn grain. Optio
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succeeding add on pastures smaller
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diverse forage have much to do with
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dairy farming. In fact, Vermont agr
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thermized (holding at a temperature
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speaking, the risks associated with
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FARMER PANEL ON LABOR HOW TO ATTRAC
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• Animal Health Products • Spec
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Cultivating Healthy Communities UVM
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139
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Hudson Valley Camemberts Pure Sheep
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Premier Dairy Service, LLC Argyle,
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www.vermontagriculture.com 145
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