The amount and physical form of feed and milk secretion in the cow

Armstrong, David G.

doi:10.1079/pns19680013

Cited by 35 publications

(11 citation statements)

References 30 publications

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“…Differences in rumen fermentation induced by the various rations may have been involved. These are known to modify the yield and composition of milk and the partitioning of retained energy between milk and body tissue (Armstrong & Prescott 1971). Alternatively, there is some evidence that energy retention by lactating cows is negatively related to the extent that digestible nitrogen intake exceeds cow requirements (Tyrrell eta!.…”

Section: Effects On Intakementioning

confidence: 97%

Yield and composition of milk from cows fed pasture herbage supplemented with maize and pasture silages

Bryant¹,

Donnelly²

1974

New Zealand Journal of Agricultural Research

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To cite this article: A.M. Bryant & P. E. Donnelly (1974) Yield and composition of milk from cows fed pasture herbage supplemented with maize and pasture silages, ABSTRACTGroups of six cows were fed rations consisting of freshly cut pasture herbage and maize silage in the ratios 1:0, 3:1, 1:3, and 0:1 on a dry matter (DM) basis in two experiments. One, in spring 1970, wa> with cows in early lactation; the other, in summer 1972, with cows in mid lactation. An additional ration of pasture silage and pasture herbage (1: 3) was included in 1972. Treatment effects during a 3-week period were assessed using covariance procedures.When maize silage was fed as a sole ration, feed intake and milk yield declined as the experiments progressed. The effect was so marked in 1972 that the treatment was abandoned.In 1970, the inclusion of 25% maize silage resulted in a 6% higher intake of digestible energy (DE) (p < 0.10) and 5% more milk yield (p > 0.10) than did pasture alone.Apparent DM digestibility of the maize was 60% and of pasture 75%. In 1972, when the DM digestibility of the maize silage was 73% and of pasture 67%, DE intake of the 25% maize silage ration was less than that of pasture alone (p < 0.05), but yield of fat-corrected milk was similar.Feed intake and milk yield decreased with increasing proportions of maize silage in both experiments.When comprising 25% of intake, maize silage resulted in significantly higher milk, fat, lactose, and protein yields than did pasture silage, even though digestibility of silage DM and DE intake were similar.The observed effects are discussed in relation to feed intake and efficiency of utilisation of DE.Up to 40% of the grain in the maize silage was not digested in 1970 and 17% in 1972. It was suggested that this was due to differences in fineness of chopping of the maize at harvest. 299

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Section: Effects On Intakementioning

confidence: 97%

Yield and composition of milk from cows fed pasture herbage supplemented with maize and pasture silages

Bryant¹,

Donnelly²

1974

New Zealand Journal of Agricultural Research

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“…In addition, H-ewes were heavier than L-ewes, and previous research has shown that larger/ heavier animals within or between breeds can produce more milk (Gardner and Hogue, 1966;Hansen, 2000). A larger body size enables the animal to have greater energy intakes, which is reflected in a greater amount of precursors for milk synthesis reaching the mammary gland and subsequently greater milk yield (Armstrong and Prescott, 1970). Table 3.…”

Section: Dam Size Effectmentioning

confidence: 99%

Effects of ewe size and nutrition on fetal mammary gland development and lactational performance of offspring at their first lactation1

Linden¹,

Kenyon²,

Blair³

et al. 2009

Journal of Animal Science

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Many environmental factors applied postnatally are known to affect milk production of the dam, but to date, the effects of different fetal environments on subsequent first lactational performance of the offspring have not been reported. Four hundred fifty heavy (H; 60.8 kg +/- 0.18) and 450 light (L; 42.5 kg +/- 0.17) dams were randomly allocated to ad libitum (A) or maintenance (M) nutritional regimens from d 21 until d 140 of pregnancy, under pastoral grazing conditions (HA, n = 151; HM, n = 153; LA, n = 155; LM, n = 153). At d 100 of pregnancy, a sub-group of twin-bearing dams was killed and fetal mammary glands collected. From 1 wk before lambing, all remaining dams were fed ad libitum until weaning. After weaning, female progeny were managed and fed under pastoral conditions as 1 group. At 2 yr of age, 72 twin-rearing ewe offspring were milked once a week for 7 wk. Fetuses from M-dams had heavier mammary glands (P = 0.03) compared with A-fetuses. Fetuses from H-dams had greater (P = 0.0008) mammary duct area compared with L-fetuses. At 2 yr of age, M-offspring had greater milk yields at d 7 (P = 0.02) and d 28 (P = 0.09) of lactation and tended to have greater accumulated milk yields (P = 0.11) compared with A-offspring. Ewes born to M-dams showed greater lactose percentage at d 14 (P = 0.002), d 21 (P = 0.06), and d 28 (P = 0.07) of lactation and greater (P = 0.049) accumulated lactose yields and CP (P = 0.06) yields compared with A-offspring. Ewes born to H-dams displayed greater milk yields at d 14 (P = 0.08) and d 21 (P = 0.02) and had greater accumulated milk yield (P = 0.08) and lactose yield (P = 0.04) compared with L-offspring. Lambs born to M-offspring were heavier at birth (P = 0.02) and grew faster until weaning (P = 0.02), matching the milk yield and composition data, compared with their ad libitum counterparts. Birth weight was not affected (P > 0.10) by grand dam size; however, lambs born to H-offspring grew faster from birth until d 49 of age (P = 0.03). In conclusion, dam nutrition during pregnancy affected the resulting milk production of the offspring and composition and growth of their lambs. In addition, dam size affected the milk production of the offspring, lactose yield, and growth of their lambs. These findings are important for furthering our understanding of how the environment to which the female fetus is exposed can affect her subsequent development and her ability to nourish the next generation.

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“…The effect of fat and oil additives on milk production and the milk fat composition has varied from study to study (Armstrong and Prescott 1971). The reasons have probably been differences in the fat content of the basic feeds and in the effect of the fat on the digestibility of the other components (Brooks et al 1954, Palmquist andJenkins 1980 Pienimuotoisessa ja vain suuntaa antavaksi tarkoitetussa kokeessa selvitettiin rypsin rasvan vaikutusta maidontuotannossa.…”

Section: Resultsmentioning

confidence: 99%

Rapeseed fat in dairy cow feeding

Syrjälä-Qvist

Aspila

1984

AFSci

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Abstract. Dairy cows on silage and hay-based diets were given a barley-oats concentrate mixture containing 13 % rapeseed feed in four different forms: diet 1) rapeseed meal, 2) rapeseed meal + rapeseed oil, 3) rapeseed meal + crushed rapeseed and 4) protected fatty rapeseed meal. The fat content of the rapeseed feed was: diets 2 and 3, 7,1 % of dry matter; diet 4, 6.3 Wo; diet 1, 2.4°7o. From the rapeseed the cows received only about 2 g digestible crude fat/kg 4 % FCM, the total fat supply on diets 2, 3 and 4 being 15 g digestible crude fat/kg 4°/o FCM. At so low a level, the rapeseed fat did not have any clear effect on the milk fat or milk protein contents, or on the iodine number or fatty acid composition of the milk fat. The milk yield increased, however, when the diet contained rapseed feed.

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The amount and physical form of feed and milk secretion in the cow

Cited by 35 publications

References 30 publications

Yield and composition of milk from cows fed pasture herbage supplemented with maize and pasture silages

Yield and composition of milk from cows fed pasture herbage supplemented with maize and pasture silages

Effects of ewe size and nutrition on fetal mammary gland development and lactational performance of offspring at their first lactation1

Rapeseed fat in dairy cow feeding

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