Effect of protected casein supplements on pasture intake, milk yield and composition of cows in early lactation

Rogers, GL; Porter, R. H. D.; Clarke, T.; Stewart, John A.

doi:10.1071/ar9801147

Cited by 30 publications

(18 citation statements)

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“…The numerical differences in milk production that we observed did not approach the same level of significance as did the differences in calf gain, although they followed the same general pattern. Increased gain in calves and increased milk production when greater quantities of metabolizable protein were supplied to cows has been observed by other researchers (Rogers et al, 1980;Lee et al, 1985;Blasi et al, 1991). In contrast, Wiley et al (1991) reported no effect on milk production or gain in calves from supplying additional CP from a high-escape source.…”

Section: Discussionsupporting

confidence: 55%

Influence of source and amount of dietary protein on performance, blood metabolites, and reproductive function of primiparous beef cows2

Rusche

Cochran

Corah

et al. 1993

Journal of Animal Science

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Forty Angus x Hereford 2-yr-old primiparous cows (358 kg) were used to determine the effects of source and amount of CP on performance, reproductive function, and metabolic status of suckled primiparous cows. A 2 x 2 factorial treatment arrangement was used; cows received either 100 or 150% of NRC recommendations for CP in diets that contained either soybean meal (low escape = L) or corn gluten meal/blood meal (high escape = H) as the principal supplemental protein source. Resulting treatments were 100-L, 100-H, 150-L, and 150-H. Cows were individually fed diets for 100 d or until they were observed to be in standing estrus. Diets were isoenergetic and limit-fed to meet NRC recommendations for NE, Ca, and P for 364-kg, 2-yr-old primiparous cows producing 4.5 kg of milk daily and gaining .23 kg/d. Increased CP tended (P = .09) to increase ADG in cows, but body condition score was unaffected. Increased CP and use of a CP source with higher potential for ruminal escape increased ADG in calves from d 0 to 97 (P = .002 and .04, respectively), which corresponded with numerical changes in milk production. Feeding high escape CP sources decreased plasma glucose and urea N (P = .04 and .0001, respectively). Increased CP tended (P = .12) to increase plasma glucose and increased (P = .0001) plasma urea N. Treatment had no effect on profiles of LH or progesterone. Although numerical differences in conception rate seemed large for 100-L compared with the remaining treatments, statistical significance was not detected.(ABSTRACT TRUNCATED AT 250 WORDS)

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Section: Discussionsupporting

confidence: 55%

Influence of source and amount of dietary protein on performance, blood metabolites, and reproductive function of primiparous beef cows2

Rusche

Cochran

Corah

et al. 1993

Journal of Animal Science

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“…The pattern of hind weight change in Expt 2 most closely parallels N levels in the selected herbage (Fig. 2) and may indicate a deficiency of essential amino acids for lactating deer, as shown for lactating dairy cattle fed fresh ryegrass-based forages (Rogers et al 1979(Rogers et al , 1980. This needs further investigation.…”

Section: Discussionmentioning

confidence: 53%

Growth responses in red deer calves and hinds grazing red clover, chicory or perennial ryegrass/white clover swards during lactation

et al. 1993

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SUMMARYTwo experiments were conducted at the Massey University Deer Unit, New Zealand in 1990 and 1991 to evaluate the performance of lactating red deer hinds and their calves grazing conventional perennial ryegrass-based pastures, red clover or chicory. In both experiments, hind and calf performance was evaluated from 1 month post-parturition over a 2½ month summer period to weaning at 3½ months of age.In Expt 1, hinds and calves were grazed on low (5·4 kg dry matter (DM)/hd/day), medium (10·8) or high (16·4) allowances of red clover, or on a medium allowance of a conventional ryegrass/white clover sward (9·9 DM/hd/day). In Expt 2, hinds and calves grazed equal DM allowances (12 kg DM/hd/day) of perennial ryegrass/white clover, chicory or red clover.Red clover generally had higher organic matter digestibility (OMD) and higher total N than ryegrass/white clover, and when grazed at equal DM allowances, promoted higher voluntary food intake in the hinds, increased calf growth (430 v. 330 g/day) and increased hind liveweight change. Although decreasing the red clover allowance in Expt 1 slightly but non-significantly decreased hind voluntary food intake and decreased both calf and hind liveweight change, all low red clover values were still consistently higher than all ryegrass/white clover values (P < 0·05). In Expt 2, chicory was of higher OMD and ash content than red clover but N content was lower and similar to ryegrass/white clover. Chicory promoted lower levels of calf liveweight change than red clover but higher than ryegrass/white clover. Hind liveweight change on chicory was lower than on red clover and was similar to ryegrass/white clover. It was concluded that red clover offers potential as a special purpose forage for deer production and that further experimental work is needed with chicory.

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“…Offering undegradable protein supplements to cows grazing generous amounts of pasture have usually not increased milk yield (Brookes, 1984;Penno et al, 1995b;Rusdi and Van Houtert, 1997;Stockdale et al, 1997), the opposite being the case when pasture availability was restricted (Rogers et al, 1980;Minson, 1981), as in the current experiments. The total diets of cows offered the MG supplements in the autumn and winter of experiment 2 were likely to have exceeded a CP concentration of 17 g per 100 g DM, which should have been adequate for milk production (National Research Council, 1989).…”

Section: Figurementioning

confidence: 52%

Responses to supplementation by dairy cows given low pasture allowances in different seasons 2. Milk production

Penno¹,

Macdonald²,

Holmes

et al. 2006

Anim. Sci.

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Two factorial experiments were designed to determine the effects of stage of lactation, and season of the year, on cow responses to supplementary feeding. These experiments were conducted over consecutive years with 128 high genetic merit multiparous Holstein-Friesian cows in early, mid and late lactation in spring, summer, autumn and winter. At each stage of lactation, and in each season of the year, cows were offered a restricted pasture allowance (25 to 35 kg dry matter (DM) per cow per day), either unsupplemented (control) or with supplement at 50 MJ metabolizable energy (ME) per cow per day in experiment 1 and 80 MJ ME per cow per day in experiment 2. The two supplements given in both years were rolled maize grain (MG) and a mixture of foods formulated to nutritionally balance the diet (BR). In experiment 2, another treatment, of a generous pasture allowance (60 to 75 kg DM per cow per day) (AP), was imposed on an additional group of early lactation cows during each season. Direct milk solids (MS) (milk fat plus milk protein) responses in experiment 1 to MG were 169, 279, 195 and 251 g MS per cow per day in spring, summer, autumn and winter, respectively, while those to BR were 107, 250, 192, 289 g MS per cow per day. In experiment 2, however, milk solids responses to both supplements during spring were slightly below the control treatment, with values similar to those in experiment 1 in summer and autumn for cows on the BR but not the MG supplement. Milk solids responses to supplementary foods were largest during seasons of the year when the quantity and quality of pasture on offer resulted in the lowest milk solids yield from unsupplemented cows. When carry-over effects of feeding MG and BR on milk solids production were detected, they were only about half the magnitude of the direct effects. Serum urea concentrations were higher in control cows than those offered MG with a similar effect for BR in all but summer in experiment 1, while serum glucose concentrations were highest in winter and lowest in summer. The most important factor influencing milk solids responses was the relative food deficit (RFD) represented by the decline in milk solids yield of the respective control groups after changing from a generous pasture allowance to restricted allowance when the feeding treatments were imposed. Total milk solids responses (direct and carry-over) to supplements were greatest when severe food restrictions, relative to the cows' current food demand, resulted in large reductions in milk solids yield of the control groups. The RFD was the best predictor of milk solids response to supplementary foods. Therefore, it is likely that cows are most responsive to supplementary foods during or immediately after the imposition of a severe food restriction.

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Effect of protected casein supplements on pasture intake, milk yield and composition of cows in early lactation

Cited by 30 publications

References 0 publications

Influence of source and amount of dietary protein on performance, blood metabolites, and reproductive function of primiparous beef cows2

Influence of source and amount of dietary protein on performance, blood metabolites, and reproductive function of primiparous beef cows2

Growth responses in red deer calves and hinds grazing red clover, chicory or perennial ryegrass/white clover swards during lactation

Responses to supplementation by dairy cows given low pasture allowances in different seasons 2. Milk production

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